BOB

Okay, so for this unit, I think I did pretty well once I got the hang of using the right operations at the right time. The only problem I was having before was that I would subtract or add something at the wrong time, such as when buying a car (when you need to add values before and after you add the taxes). I think I strong point for me was that for the options questions I had a fairly easy time with it because by the time we got to it the only new thing was the common sense added to the answers. Good luck on the test everybody!

Scribe Post

Hey everyone, my apologies for the late post (I just got home). But on with the post!

Today was a double class day, and in the morning we went over the spreadsheet on Jess' truck problem., and how to calculate the Present Value of a lease loan.



After that we went over last night's homework and used the spreadsheet as well to solve that problem. If you haven't noticed, there is a link underneath May 7's slides for you to use the spreadsheet at home.

At the beginning of the afternoon class we continued by comparing what happens to the monthly payments and total interest when you change the percentages, and when you change the amount of payments (length of loan). We found out that changing the percentages for the same loan does not significantly affect the monthly payments, or the total interest paid. However, if you change the length of the loan, you will get much bigger changes:

- On a shorter loan, i.e. 3 years, your monthly payments will be higher, but the total interest paid will be smaller.
- On a longer loan, i.e. 5 years, your monthly payments will be smaller but you will end up paying a lot more interest in the long run.

We were then left with Ted's truck to work on class, and whatever you did not finish in class is tonight's homework. Good luck to all!


And for tomorrow, Melissa can have the honors of scribing.

Scribe Post

Hello everyone, here's the scribe post for March 19th.

Today we had a double class, and on the morning class we had a quiz, which was composed to two questions exactly as they appeared on last night's homework. It was an easy way for Mr. K. to tell who did their homework and who did not. We then went over all the answers in it and how they are marked, so we have a better idea what can hurt you in a test in the future. Remember, SHOW YOUR WORK

After the quiz we started the new lesson for the day, called The Normal Curve. By definition, the Normal Distribution is a frequency distribution that can be represented by a symmetrical bell-shaped curve which shows that most of the data are concentrated around the centre (or the mean) of the distribution.
Remember, normally, data would never fit in the normal perfectly, but there are many situations where the data is approximately normal.

We also learned that the Normal Curve is related to the standard deviation rule mentioned earlier in the course, the 68-95-99 rule, which means that:



Then, for the afternoon class, we were separated into groups and worked on 4 different problems using the normal curve. We had to find out if the data was approximate to the normal distribution or not, and also learned a new way to find it in your calculator... by graphing it!

So, the first way is to find the mean and the standard deviation, by going to 1 variable statistics, or 1-Var Stats, and adding/subtracting the standard deviation to the mean once, twice and three times. Then you turn what you just calculated into percentages, and compare with the 68-95-99 rule. If the percentages are somewhat near 68, 95 and 99, then the data is normal.

The second way, which in my opinion if much easier, is to simply list all the data in your calculator, and graph it by going to stat plot and setting the Xlist to L1 (or whichever list you punched the data in) and the Frequency to 1. Then you would go to zoom and select ZoomStat so the graph fits nicely in your screen.


Well, I guess this about sums it up for what we did today in class, hope my post was of any help. The scribe for tomorrow can be Adamson (bet you wish you didn't give me birthday beats yesterday now haha)

Homework comment

Mr. K, this homework is impossible (haha). And yes, you read my mind, those were my exact intentions. Everyone else, good luck with it.

So ok, there is my comment on the homework.

Scribe Post

Hello everyone, on with the post now.

Today in the morning class we quickly went over the homework of two days ago, and then were separated into groups for a workshop (since we are done with the unit). The answers for the homework can be seen on the slides posted by Mr. K.

When we started the workshop we had a simple question, relating to Pascal's triangle.



Keep in mind that the numbers in orange are the total amount of ways of getting from A t C as well as from A to B, passing through point P. The numbers in green are the total amount of ways from C to D and finally the numbers in blue are from D t B. If you multiply all of the results (excluding point P) you will get the total amount of ways to get from A to B, which is 6x2x10 = 120

We handed that in for marks, then were left with harder problems to solve within our group. Whichever group had someone go up on the board with a solution would get points (marks).

We did many of those on the afternoon class as well, so I'll just summarize the ideas here.

"Design an experiment using the random number
function of your calculator to determine the
probability of passing a six-question multiple choice
test if you guess all the answers. Each question has
four answers, and one answer is correct in each case.
How many simulations would seem reasonable? What
is the experimental probability of getting at least 50%
on the test?"

For this problem we had 3 different solutions, that were all close to the real value. You you'd need your randBin function of your calculator for it, with the numbers (6, 1/4, 5) meaning that every result you'll have 5 numbers showing, ranging from 0 through 4, for the 6 questions in the problem.

The question after that we had to remember the difference between Pick formula and the Choose formula, being that the order of the numbers matters for Pick formula (I use the saying P is for picky to remember that)


"A party of eight boys and eight girls are going for a picnic. Six of the party can
ride in one car, and four in another. The rest must walk. (Assume anyone can
drive.)"

For this problem we used the choose formula to solve, since the orders of boys and girls do not matter. Remember that even though we did it in separate steps in class, we will most likely be asked the last question in a test.

Finally we were asked a simple question again:
"Fred is in a class that has 7 boys and 15 girls. The teacher selects partners for
a project by drawing names from a hat. What is the probability that Fred's
partner will be a boy?"

The solution for that was rather easy so I'll just explain what to do. Since Fred himself is one of the 7 boys in his class, there are only 6 other boys that can be his partner, and there are 15 girls, making it a total of 21 possible partners. So, his chance of being teamed up with a boy is 6/21, or 29%.

Well, that's all we did today. Remember to do your BOB posts since our test is on Tuesday. Bring up any questions for Monday's class, which we will use for a pretest.

And... the next scribe is..... *drum roll*
JESSIE. Good luck, haha.

BOB - Matrices

I don't think I had a hard time getting the hang of matrices. For once i feel like I understand what's going on in Math class, haha. Sometimes a question does look tricky, especially on the last worksheet we had to do, but when i looked at the answer sheet and saw that I got the same answer, I realized I was guessing it right. On the two questions that I got wrong, I quickly realized what I did wrong and fized my mistake. After that I double checked with some classmates and in the end we had the same answers. The only advice I have for the rest of you is make sure you read the question more than once, even if you think you know what it's asking. I made the mistake of assuming it was asking the obvious a few times already, and believe me, it makes you feel silly when you see you got it wrong.