Number of cars

0

1

2

3

4

Probability

0.03

0.13

0.70

0.10

0.04

Allyn surveyed the teachers she works with at GCA to find out how many cars they own. She created a provability distribution which is displayed below. What is the average number of cars owned by each teacher? (You must show all work to receive full credit.)

To solve the average number of cars owned by each teacher, multiply the number of cars to its corresponding probabilty and add them up.

ave = (0 * 0.03) + (1 * 0.13) + (2 * 0.70) + (3 * 0.10) + (4 * 0.04) ave = 0 + 0.13 + 1.40 + 0.30 + 0.16ave = 1.99 or about 2 cars is the average number of cars owned by each teacher