A Short Lesson on Probability

By Mrs. Garcia

What are the Chances?

A probability experiment is something that can happen in more than one way.

The outcomes of an experiment are the ways it can happen.

The event is the particular outcome you are looking for.

6 10 12 52

?H HT T H T T H

The Probability of an Event =

P(Event) = the number of ways it can happen

the number of possible outcomes

P(H+T) = 2 = 1 4 2

__ __

B

A

B

AA

B14 12

35

25

14

Try these…a) b)

P(red)

P(blue)

P(yellow or blue)1

5

What is the probability of getting 4 fives?

P(4 fives) =

CARDS

413

What is the probability of getting an even number?

213

DICE

P(even) =

What is the probability of rolling two coins and getting H first and then T?

P(H & then T) =

COINS

14

What is the probability that you will get an A this marking period?

About the Author

Hello, my name is Maria Garcia and I really enjoy working with computers. I also

find probability a fascinating subject. I hope you do too!

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