Page 219 - Math Course 3 (Book 2)

Probability Distributions

Skill Practice!

The owner of a barber shop asked customers how many hair cuts they received in a 3-month period.
The results are shown in the table.

1. Find the probability that a randomly-chosen customer Number of Hair Number of
had 3 haircuts in the 3-month period. Cuts Customers

1 14

2 20

2. Find the probability that a randomly-chosen customer 3 45
had fewer than 3 hair cuts in the 3-month period.
4 33

The owner of a barber shop asked customers how many hair cuts they received in a 3-month period.
The results are shown in the table.

3. Show that the probability distribution is valid. Number of Hair Number of
Cuts Customers

0 0.264
1 0.087

4. What is the probability that a randomly-chosen 2 0.223
customer had 3 or more flights in the 1-year period?
3 0.162
4 0.203
5 or more 0.061

A survey asked homeowners how many televisions they have in their home. The results are shown in the
table.

5. Find the probability that a randomly-chosen home Number of Number of
owner has 1 television in their home. Televisions Homeowners

1 42

2 38
3 25
6. Find the probability that a randomlychosen
homeowner has more than 2 televisions in their home. 4 or more 11

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