Wednesday, April 30, 2008

Scribe Post

Today we studied about The Rule of 72. We can use this rule to calculate the "Interest Rate" and the "# of years to double" your amount of money. Here is the formula:
(Interest Rate) x (Years to double) = 72.
Because I can't find today's slide so I don't remember the question we did so clearly. It was like: You invest your money in 2 ways: $1200 a year or $100 a month with the interest rate 6% in 1 year. Compare those 2 ways. Here is my answer for this question:
a) $1200 a year:                                       b) $100 a month:
N=1                                                              N=12
I%=6                                                            I%=6
PV=0                                                           PV=0
PMT=-1200                                               PMT=-100
FV=alpha+solve = 1200                           FV=1233.556
P/Y=1                                                          P/Y=12
C/Y=1                                                          C/Y=12

If you invest your money $100 a month , you will gain extra:
$1233.556 - $1200 = $33.556

Next scribe is Ari5

Today's Slides: April 30

Here they are ...

Wednesday, April 30,2008

This is my first scribe......I dunno what to put in here. OK
Today!!! we learned about the "Personal Finance".
The slice Mr.K uploaded was explain everything. Nothing i can tell.

Sunday, April 27, 2008


Hey everybody ! Test is tommorow! At the moment I'm studying as much as I can to do awesome at this test because I really want to pass this course. The unit is pretty easy except for the wording of course *sweat* I have trouble understanding the wording of the questions for this unit >< But I think once I get it it's gonna be a bit smoother on the road to answer the questions.

Well for this unit I learnt how to properly use the protractor once again *laughs at self* I had forgotten how to actually properly use one=S but, luckily I slowly remembered how to and I've been doing alright for the questions. Good luck on the test tommorow guys going back to studying!

BOB- vectors

ok for some very strange reason i find this unit quite difficult at times but i hope that by practicing more with the formulas that adamson referred to, i can figure out the problems i just think that i get stuck when it says "due" or "with a bearing" in the word problems. otherwise i think i'll be ok... but i gotta go back to studying =(


Hey guys its alvin. right now im studying for the test tomorrow. the only muddiest point i have is the wording, some of you guys probably have the same problem as me. but 1 thing that i found useful is if u actually write the actual words down on ur paper, it begins to make sense. per instance:

1 banana vs 1 apple

re-write 1 banana then below it write 1 apple. then all u have to do is figure it out 1 by 1. my strength pretty much if i get the wording, i can solve it right away- -so pretty much everything is okay, im just worried about the wordings for tomorrow. well goodluck guys!

Dear BOB

Dear BOB,

So there's this girl(LOL). That's not my BOB. Anyways. Guys study for your test tomorrow. Do more problems. Go over all the problems that we did in class or homework. Make sure we all get it. Vector is one of the easiest unit but we still got to do our best to pass the test. Well, the part I didn't get in Vector unit is how to find the BEARING. But as I re-do all the problems we did then I'll be able to get it hopefully. The one thing I understood and liked about the unit is measuring. Using a scale and sketching on the paper and writing down the right degree. So, I think that's all for now. Good Luck on the Test tomorrow. Eat an energy bar(VECTOR) before you take the test to do well for the test. Alright laters mathers.

Yours dearly,
Wilfred N.

Student Voices Episode 2: Tim_MATH_y

In this episode Timothy came back to school on Friday afternoon to talk about his week attending the miniUniversity program at the University of Winnipeg. He talks about the differences he finds between teaching and learning at high school and university and describes learning in the university classroom using a thought provoking metaphor, listen for it. Also, we have a cameo appearance by two very special people at the very end.

Please feel free to leave Tim_MATH_y your comments here on this post.

(Download File 7.2Mb, 15 min. 3 sec.)

Photo Credit: Shadow singer by flickr user EugeniusD80


Alright, test moonday on vectors; probably the shortest unit in this class. I really don't find anything too difficult in this unit, except when trying to draw the diagram; I tend to overthink the question an second guess my diagram. That would be my down fall to this test; don't overthink the question.

Formulas you should remember (all found in April 22 slides):

- Sine Law

- Cosine Law

- Pythagoras Theory

- Properties of Angles

Another thing you should remember to use is, the TRISOLV2 program which can help you find angles and sides (TRISOLV2, April 23 slides). You can use the TRISOLV2 program to try to solve the question; you can also use it to help check your work. All in all goodluck to everyone on the test tomorrow.
Oki ...CowMIlk continue to be the scribe T_T . How about your pre-test ...that was not easy :P and I hope the real test will easy . Friday, we worked on the pre test and corrected the "challenge question", and we had a small problem... Let's check the answer of "challenge question".

This is wrong because the question is : "the ship NEED to travelin direction of 40 degree" , not "the ship to travel in direction of 40 degree ". So the resultant vector must be bearing 40 degree and the ship must travel with the vector which add the vector of current = the resultant vector ( we thought the ship travel in direction of 40 degree and is pushed by the current <== that 's wrong, the ship must keep its direction of 40 degree).

So the right answer must be :

Next scribe will be Carmel
HI allll !! Test tomorrow >"< .In this chapter, we just have few formulae: law of cos, law of sin, Adding 2 vectors, but when apply there formula to exercises, we must be careful . Finally..good luck

Saturday, April 26, 2008

Well the test is on monday, and i hope i do good, but the problem i have is drawing the diagram. I can do everything else okay, but its difficult for me to draw the diagram. I'll ask others on how to draw the diagram, but i'm sure i'm not the only one with this problem.

Friday, April 25, 2008

Today's Slides: April 25

Here they are ...

Hey guys the scribe post for today was me and well I will be happy to say that our "Vector Unit" is finished! Which will lead us to our "Personal Finance Unit" I'm assuming. The pre-test is tommorow I hope all of us will do well for the both the pre-test and the real test. I'm still not that confident with the vector unit but, I'm pretty confident of this question which I answered in the homework given just a day ago.

First Step: You are given an angle of 150 degrees and a magnitude of 550mph. Draw a Cartesian plane and then use a protractor to measure the angle of 150 degrees and draw a line for the first line.

Second Step: With the 2nd angle and magnitude given draw the line which is a bearing of 80 degrees and a magnitude of 175mph.

Third Step: Draw the Resultant vector by drawing a line from the tail of the arrow to the tip.

Fourth Step: Find the angles and sides you have and see what formula to use which in this case is the Cosine Law because you have a Side, Angle and Side.

Fifth Step: Square root the answer you got to get the answer by itself and not squared.


You step most the Fourth and Fifth step and just use the program "TRISOLV2"

Well this ends my Scribe post for today and the next scribe will be... CowMilk

Thursday, April 24, 2008


Kay so...since we're going to have a test real soon, I'll post up my blog now. Um.. this unit went by pretty fast compared to the other units and I'm not sure if I'm even ready for the test. I found drawing vectors in scale diagrams the easiest. However, what I found difficult was seeing the letters in the angles.. the alternate sides and corresponding sides.. the Z's and the F's. But after going over the homework from previous nights I think I got the hang of which angles belong where. The only thing I'm concerned about now, is whether or not I'm doing the work right... Mr. K, can you post up the answers to our homework so that I can compare my answers to the actual answers to the questions? It'll help me a lot when I study over the weekend =). Anyways, the other thing I don't understand is how to use the function TRISOLV2 on my calculator because the day we were learning how to use it, my batteries died out. But I don't mind it much because I like dealing with the formulas Sine Law and Cosine Law. Other than that, I hope I do well on both the pre-test and the test 'cause I really want to bump up my mark.

Today's Slides: April 24

Here they are ...

Wednesday, April 23, 2008

The next scribe will be.......................................................................................................christine m.

Today's Slides: April 23

Here they are ...

Tuesday, April 22, 2008

Scribe Post April 22

Hi guys, today we studied about solving problems using Trigonometric Method: Pythagorean Theorem, Law of Sine and Law of Cosine.

You can use Law of Cosine when you have Side Side Side (SSS) or Side Angle Side(SAS). Otherwise, you can use Law of Sine to solve the problems.

We also did an example by using Law of Cosine and Properties of angles. Here are the answers:
_ Magnitude of the resultant vector: 0.0644 N
_ The direction of the resultant vector: bearing 70.48 degree.

The next scribe will be ickie .

Today's Slides: April 22

Here they are ...

Monday, April 21, 2008

Scribe Post - Vectors

Hey guys, I'm the scribe post for today, April 21st.


As most of you should know, we had a substitute today for class.
We were given a worksheet to complete on vectors.
Here it is...

Tomorrow's scribe will be . . . . .
(unless someone would like to volunteer *evil stare*)

Vectors Scribe Post

Sorry for the late post guys. here is just a quick rundown of the stuff that we learned from vectors.

For people that were confused about what the difference is between scalars and vectors, here is the definition:
Scalars are quantities which are fully described by a magnitude (or numerical value) alone.
Vectors are quantities which are fully described by both a magnitude and a direction.
If you have more troubles with scalars and vectors, check this site out:

Sunday, April 20, 2008

Alright Ladies and Gentlemen, I don't really have such fancy tools to do this post, but i'll try to explain what we learn.

Adding Vectors Using Scale Diagrams..
-A vector is represented by an arrow. Its LENGTH determines its magnitude and the tip determines direction.

The Triangle Method : Tip to tail.

The red: Is the resultant of the two vectors
The Black: are the vectors in which the arrow, connects to the
end of the second arrow(vector). Which is why it is called tip to tail.

Basically we measure using a ruler.
then measure the 2 end points to find the resultant of the two vectors.

The Parallelogram Method: Tip to Tail
The red: Is one vector and the other red one without the arrow is the mirror image on the other side.
The blue: is the other vector, with the same mirror image.
The green: is the resultant of the two vectors.
Now see how the two vectors tails connect, thats why its tip to tail.
the arrows show the directions each vector got copied from.
I don't see the big difference, the resultant is still the same as a the triangle method.
So all we use is a ruler to find the lengths, but if you wanna find the angles, you got to use a protractor.

This is basically what we learned because we had the afternoon off. The next scribe is C.J

Saturday, April 19, 2008

Student Voices Podcast Episode 1: Jessie

I was talking to Jessie earlier this week while helping her review over the lunch hour. I found her comments so compelling I asked her (and later her parents) if I could record and publish her comments so other students could hear what she had to say. I've long thought students need to hear from other students how they best learn to help them all learn.

This is the first in what I hope will be a series of podcasts called Student Voices. I'm hoping to have one of these short conversations with a student published each week. If you'd like to volunteer to be featured in one of these just let me know.

In this episode Jessie shares how she uses her class blog to learn and describes her personal "tipping point" from being confused to understanding Statistics very well. She also discusses the value of learning conversations and how sometimes being a "teacher" and sometimes a student helps her learn.

Please feel free to leave Jessie your comments here on this post.

(Download File 5.6Mb, 11 min. 40 sec.)

Photo Credit: Kids of conversation by flickr user Kris Hoet

Wednesday, April 16, 2008

SO Statistics is the hardest unit, and I'm sure everyone agrees with me. I know how to do the work, its remembering how I did it that [gives me a hard time]. I haven't had much time to go on the computer to check posts, so I just download the homework, and print it. I guess what really got to my head is i expect what i recently learned to be on the pretest, so I totally forget what the earlier work we did. That would be shade norm function, and all the little problems that come with it. Like for instance, find 5 deviations to the left or right, adding and subtracting the deviation to the mean, and all that jazz. Hopefully I'll do alright and leave my first answer on the paper and don't second guess myself.


well this was a pretty hard unit, and i know many of you agree. I for one had many weak areas that I need to improve upon. I know that i can't stop studying, i hope i do good on the test. The concepts of knowing when the right time to use normalcdf, normalpdf, binomcdf, and binompdf is starting to become a bit clearly but still I may need to further my knowledge.

good luck to everyone tommorow.


Statistics definitely one of the hardest units that we did so far.. Not too confident at all with it but, trying my best to do it even though I know I'm going to do bad. Doesn't hurt to keep studying right? Haven't had much time to do homework at all but, I actually have been trying during the prep time I have to keep up. I actually think I understand "Confidence Intervals" but, not too much on the others. The problem is just knowing when to use normalpdf, normalcdf, binompdf, or binomcdf is the thing. I'm doing my best to understand these functions though and it seems as though if I wanted to use normalcdf it'd calculate a continuous data and binomcdf which would calculate discrete data meaning no decimals. What "normalcdf" means is "Normal Cumulative Distribution Function" and "binomcdf" means "Binomial Cumulative Distribution Function." An example of one is the lightbulb question in the pre-test. Well I hope this is a good enough B.O.B. and wish everyone Good Luck on the test tommorow and study hard!


Hey guys this is Alvin. I'm pretty nervous about the unit test, i dont think that im going to do well on it. i actually had a few muddy points, but right now my only concern is the confidence intervals. its still pretty blurry to me, but thanks to the blog, i think ill be alright.
I think that my strongest point is in the shadenorm(), i spent some time with it so it shouldnt give me any hickups.


...Bob.... for.... Statistics....

This actually was a harder unit than i thought; at first i really didn't know the difference or how to use either normalcdf, or binomcdf. Later on, i learned that using binomcdf, means that the data is discrete (not involving decimals). Ie: you can't have half a person or half a light bulb. On the other hand, normalcfd deals with continous data (including decimals) aergo; questions like eating 1/5 of a sandwich can be done with normalcdf. Although i have some vague ideas on using these functions, i'll still have to review my notes. I also have to get reacquainted with using, InvNorm and ShadeNorm, since i forgot how to use them.... -_-"

In conclusion, study, study, study; i still want that 90%+ mark in this class. Goodluck to everyone.
HI! This is COwMIlk How you guys prepare for the test about statistic tomorrow?? I think the important thing in this chapter is normal distribution .Follow with this is some formula :
+ Shapenorm(Low Value ,Hi value,mean, but I think you guys should change to Z-score ^^ because that easier (I think) there's how to use shapenorm: shapenorm(Low Z-score,Hi-Z-score).
+ InvNorm(Percent) this one is easy to use ,when you have the percent ,just use this formula and u will get the Z-score,remember this percent must be from the minimum point at left of the bell Shape to right of the bell Shape .
+ And everyone must know how to calculate Z-SCORE

Binomial Distribution
When binomial distribution approached to the normal distribution (np AND nq >= 5) we can use the formula of normal distribution.
+ binomialPDF(trial,percent,x) :
Ex: flip the coint 20 times
Trial --> we have 20 letters (H or T) --> trial is 20
percent--> 1/2--> trial is 1/2
The calculator will create 20 letters ( H or T)
X(optional of this formula) :if you don't put x , the calculator will show all of your results. (all the percent .If u put x = 5,the calculator only show 1 result ,that is the percent of exactly 5 letters in 20 letters.

+ binomialCDF(trial,percent,x) : the same with formula above, but it's have a LITTLE difference :P . When we put x=5 , the calculator will add all the percent from TTT(all of T)...or (All of H) to 5 letters H in 15 letters T (or 5 letters T in 15 letters H)

That's some things i think importance ...and ...that it ^^ ...GOODLUCK

MR.K when we hand in 4 questions ?????????


Dear BOB,

I just wanted to let you know that STATISTICS is the hardest unit in Applied Math 40S. So, now I need to study and analyze each problems that we did in class or as for homeworks to do better for the test tomorrow. Mr.K. has done everything he could to help us understand the concept of the following: normalCDF, normalPDF, binomPDF, binomCDF, ShadeNorm, and invNorm. But now it's our turn to apply that to the real world. That's why they called this course APPLIED MATH. Those are the keys we need to remember to be able to answer the test questions. And now I kinda understand what those functions mean. Just good luck to everyone and study and review your notes, problem questions, and quizzes to really help you succeed in the test. GOOD LUCK! Adios Amigos.
Hey everyone its Michelle and this is my BOB. When I found out that we were doing statistics I almost freaked out because I know that this unit would be tricky. At the beginning of the unit I was having problems on determining on when to use binomcdf and normalcdf. I thought that I would never understand it. But after going over it many many times it finally makes sense to me. =) I know that when using binomcdf your using it because the data involved is discrete meaning not having a decimal place. For example you couldn't have half a person. And with normalcdf the data involved is continuous which has decimal places. An example would be your weight or your height and both functions you use are commulitive which is when you add up the numbers as you go along. The one thing that still hasn't made complete sense to me is when to use invNorm. So I will definitely have to look into that tonight so that I can do better on the test tomorrow. Good luck everyone, and hopefully we will all do good on tomorrows test!

Today's Slides: April 16

Here they are ...

Scribe Post for April 8th

Wow this Scribe post is really late. on April 8th we learned how to use the binomcdf function on the calculator while using the binomial distribution and normal approximation.

There is a link between the normal approximation and the binomial distribution and that is if np is greater than or equal to 5 and nq is greater then or equal to 5. We also learned that if the binomial distribution can be approximated by a normal curve then we can calculate the mean and the standard deviation:

mean=np standard deviation=square root of npq.

when we use the binomcdf function we check what the question tells us like if there are a certain amounts of items and the question wants us to find out how much more than another number then we use it but if the question asks us to find the exact amount then we use the binompdf. binomcdf adds up the data because the c stands for cumulative.

thats all I remember in class that day but next time I will make sure that I am ready.

Tuesday, April 15, 2008


ok so this is my BOB for the statistics unit so here i go...
as well all know this unit is a toughy and yes i'll admit it's not my favorite =\ but since i need a good mark on this test i wanna make sure i get through it in 1 piece. Maybe after i read over everything a few times it'll stick but as of right now i feel we've learned so much that it's in my head just floating around all unorganized. one of my most biggest weaknesses is identifying when to use normalc/pdf or binomialc/pdf.. i understand when to use either cdf or pdf but it's the normal or binomial that confuses me now.

ok i'm going to go on studying since................ MR. K. I GOT MY BINDER BACK! =)


Sorry for the lateness of this post, this is the scribe for April 14, 2008.

So we talked about using a confidence interval of 95% and a margin error to answer certain questions. Like how certain we can be that the results would be approximately the same if another survey is done, and based on the results you can see what the smallest and largest numbers are. 

to find a 95% interval you have to find N, the mean, and the standard deviation. you first find the margin of error which is when you multiply the magic number 1.96 by whatever the standard deviation is. If you want the percent margin of error you divide the margin of error by N. from that you subtract and add your margin of error to the mean. This finds the smallest and largest numbers you can have, thus the 95% confidence interval. 

If you need any help then the slides from the 14th can help as well.
and michelle is the next scribe, but she has already completed hers.

Hi everyone its me michelle. :) As you all know all that we did today in class was have a pre-test, so as a reminder don't forget to do a BOB! The next scribe is....Alvin


So I thought I was prepared to write our statistics test this Thursday but after doing the pre-test today, turns out I'm not as ready as I thought because I was blanking out on most of the questions which isn't a good sign. However,what helped me the most in this unit was keeping up with what we did in class by going through all the slides and writing down my own notes to get a better understanding. I don't know but I really liked this unit, I thought it was pretty fun lol yeaa I found this unit a lot easier than the probability unit and I know some or all of you won't agree with me buhh putting the time and effort really helped me a lot. I liked how we learned all the new functions in our calculators and knowing when to to use it and what values we need to plug into them. Being the scribe also helped me learn the difference between using standardized and modified distributions and when to use invNorm. Anyways what I found difficult in this unit was finding the Y-scale when we needed to graph things and when we have to explain things. Like why is binomalcdf and normalcdf's values are relatively close. I know why, it's just that I'm having a hard time to find the right words to explain it. But other than that, I understand everything else, I just have to review all my notes and hopefully I'll do fine on the test.

Today's Slides: April 15

Here they are ...

Monday, April 14, 2008

Dear BOB,

Considering there's a test very soon... I'm guessing we need to be bob'ing. So here's mine.
Something that I thought was "cool" that I learned in class quite a while ago in this unit was that whole deal about a metre ruler or something. You know.. when Mr. K. asked another teacher to try to explain to us how a 1m ruler is made and such. It was very interesting and complicated.. but nonetheless "cooool" ya digg? So in the end, after that whole complicating, -and cool, explanation of golden rulers and everything, we learned that things are based on a STANDARD. Just like how rulers and measurements are (or should be) the same 'around the world'..

Thank you Mr. K. for taking that extra step to teach us in depth of rulers. xD

Oh and yeah.. I think this was how we were introduced to standard deviations.
I can't remember though.

Today's Slides: April 14

Here are the slides. Answers to the homework is below ...

Sunday, April 13, 2008

April 11, 2008

The next scriber will be *drum rolls* Jessie!
Haha.. if you folks don't know what the picture is, it's a "Lion Dance Drum." If you want to watch a lion dance come on the 85th anniversary of our school!

February 12,2008

Hey guys! I'm very sorry about the late scribe. Just a little bit of misunderstanding happened but it's all good now. Well, here we go. SCRIBE FOR THURSDAY:
First, we did a quiz in the morning to test what we understand about normal and binomial distribution so far and here's the quiz that we did:

So, that was the quiz that we did in the morning and in the afternoon we did a problem about SOLVING THE BINOMIAL PROBLEM AS NORMAL DISTRIBUTION.

When to use:
normalpdf & binomialpdf = when a discrete data can't have a half a number.
normalcdf & binomialpdf = when a continuous data can have half a number

That's all I can do for the scribe for Thursday. Hope this helped some of y'all.
Next scribe will be chosen by DAVID.

Wednesday, April 9, 2008

Today's Slides: April 9

Here they are ... Homework is on the last two slides ...

Tuesday, April 8, 2008

Today's Slides: April 8

Here they are ... HOMEWORK is on the last three slides ...

Scribe Post

Whoops the sentence above is suppose to say:
"Sorry for the LATE post (again)..."

The scribe for the next class is... Chris29

Monday, April 7, 2008

Today's Slides: April 7

Here they are ...

Scribe Post


Sorry about putting this up a day late everyone! Well yesterday in class we went over the homework Mr.K had assigned us on tuesday. The 4th question that was done on the smartboard had 2 different ways to be solved. There was the long way to approach the question and a short way. I'll tell you how the long way went first. For the long way to solve the question we first had to find the z-score, second after finding the z-score you would use "normalcdf" which can be found on the TI-83 Plus by pressing the "2nd" function button then "VARS" to use the "DISTR" a
nd then "1" to use "normalcdf".

This is the question: A college aptitude test is scaled so that its scores approximate a normal distribution with a mean of 500 and standard deviation of 100.

(a) Find the probability that a student selected at random will score 800 or more points.

Here's how the long way of looking at this question would look like below:

The shorter way is to just simply use normalcdf and input these numbers below:

normalcdf(800,1000, 500, 100) = 0.001349
= 0.13%

The reason why you put put these numbers in one go is because normalcdf would find the z-score while also finding the probability of a student selected at random would score 800 or more points in one go which does the exact same thing as the long way does.

The next question that goes with the last question could also be solved in two ways.

Here's the question.

(b) Find score x,such that 76 percent of the students have a score less than x.

Here's the long way of how to look at this question and solve it.

invnorm(0.76) = 0.7063
= 70.63

Mark = 500 + 70.63 = 570.63

Here's the short way of how to look at this question and solve it.

invnorm(0.76,500,100) = 570.63
X = 570.63

Don't forget to put x = 570.63 because if you don't some people wouldn't know what the number is and thus would have a mark deducted away from you.

That's all that we did for the class we did on Thursday March 27, 2008.


Today for class in 3rd period Mr.Kuropatwa gave us our assignments, quizzes and tests back.
Mr.Kuropatwa then talked about the learning tree with us which led to our project of the semester. The project is to create 4 of our own problems, which you can work with a partner or 2 partners but, if you work with a partner you would have to do 5 problems and 6 problems if you have 2 partners. The project is due sometime in June or so but, for the break Mr.K wants to have the questions by the friday we come back. For this assignment given to us for the break we can copy someone else's problems. The project with the due date in June has to be created from your ideas and from scratch. The site that our project will be posted on is
That's all we did for class on Friday March 28, 2008. We didn't have our 5th period class of the day because of the activity for Spirit week in the afternoon.

Also sorry for the like late scribe everyone-_- Some reason my last post I did on Saturday didn't work and well no one told me it wasn't up until I went to check the site myself. Won't be in class today though, because of an appointment I have.

The next scriber will be.. mercee

Sunday, April 6, 2008

Spring and the Main Thing

Spring has finally sprung here in northern Ohio!!!! I hope that's true for you too!! Folowing your spring break, how easy will it be to do the above? Or is it important?