Section 13.3

Probability

In tossing a fair coin, what is the probability that a head comes up? the probability that a tail comes up?

OBJECTIVE 1

four

OBJECTIVE 2

Calculate the probability that in a 4-child family there are 3 boys and 1 girl. Assume equally likely outcomes.

Consider the experiment of drawing a card from a standard 52 card deck of playing cards (ace through king, four suits). Let E represent the event “draw a heart” and let F represent the event “draw an ace”.

OBJECTIVE 3

If 0.3, 0.4, and 0.2,

find the probability of or . That is, find .

P E P F P E F

E F P E F

If 0.3 and 0.2, and and are mutually exclusive,

find .

P E P F E F

P E F

OBJECTIVE 4

On the local news the weather reporter stated that the probability of rain tomorrow is 30%. What is the probability that it will not rain?

What is the probability that in a group of 15 people at least 2 people have the same birthday? Assume that there are 365 days in a year.