According to a published study, 1 in every 8 men has been involved in a minor traffic accident. Suppose we have randomly and independently sampled twenty-five men and asked each whether he has been involved in a minor traffic accident. How many of the 25 men do we expect to have never been involved in a minor traffic accident? Round to the nearest whole number.
A) 25
B) 8
C) 3
D) 22

Question

Quizplus · Accepted Answer

The probability that a man has been involved in a minor traffic accident is 1/8, so the probability that a man has never been involved is 7/8. For 25 men, the expected number who have never been involved is 25 * (7/8) = 21.875, which rounds to 22.

According to a Published Study, 1 in Every 8 Men