Scribe Post:
February 19 - Introduction to Probability

Im not sure if i am supposed to be the scribe for today since i don't see the last scribes that we're supposed to be posted (unless it's just my computer). But i was told today in class by ickie that i am the next scribe. So just incase, I'll do the scribe for today anyway.


Today we started our second unit which is on Probability.
We learned a variety of language today, with many definitions and some formula's.

Probability: The branch of mathematics that deals with chance.
Sample Space: The set of all possible things that can happen for a given set of circumstances.
ex: Rolling a die 6, .. the sample space would then be {1,2,3,4,5,6}.

Event (E): A subset of the sample space. One particular outcome for a given set of circumstances.
Simple Events: The result of an experimental carried out in 1 step.

Compound Event: The result of an experimental carried out in more than 1 step.

Certain Event: An events whose probability is equal to 1.
Impossible Event: An events whose probability is equal to 0.


Calculating Probability Event:


* The "total number of outcomes" is the sample space.

Probability can be expressed as:
- A ratio
- A decimal
- A fraction
- A percent

**Important: Probability is always a number between 0 and 1!


Complimentary Events:
Is either written as E' or E. The compliment of an event refers to the case where E does not occur.

Ex: H= Drawing a Heart from a deck of 52 cards.
H'(the compliment)= Drawing a card that is not a heart.

Calculating Probability Complimentary:
P(E) + P(E') = 1

so ....
P(E) = 1 - P(E') .... OR .... P(E') = 1 - P(E)


Anyway, I hope that helped you guys alittle bit. If not, there are the slides that Mr. K posted up. Maybe you'll be able to understand it better there.
The next scribe will be christine m.