**Scribe Post:**

February 19 - Introduction to Probability

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.**

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