Sect. 12-4 Probability

Def: Probability is the measure of the chances of an event happening

A desired outcome is called a success

Any other outcome is called a failure

The probability of success is given by

The probability of failure is given by

fs

ssP

sf

ffP

Def: If an event can not fail then P(s) = 1

Def: If an event can not succeed then P(s)=0

The sum of P(s) + P(f) =

1. If fPfindsP7

1

2.A bag of m & m’s contains 12 red, 11 yellow, 5 green, 6 orange, 5 blue, and 16 brown candies. What is the probability of choosing a yellow at random?

3.A bag contains 6 white, 3 blue and 7 green marbles. What is the probability of choosing

a) white

b) marble is not green

Def: The odds of a successful outcome is the ratio of the number of ways it can succeed to the number of ways it cant fail.

given: s : f

4. Find the odds of rolling two dice totaling 7

4. If the probability is ¾ find the odds.

6. If the odds are 6 : 5 find the probability

7. A bag contains 1 green, 4 red and 5 yellow balls. Two are selected at random. Find the probability that 2 are red?

8. What is the probability of choosing the million

dollar case on ?

9. What are the odds of choosing the million dollar case on Deal or No Deal?

Assignment: Practice 12-4