According to a published study, 1 in every 4 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) 19
B) 4
C) 6
D) 25

Question

Quizplus · Accepted Answer

If 1 in 4 men has been involved in a minor traffic accident, then 3 in 4 men have not. Therefore, for 25 men, we expect 25 * (3/4) = 18.75, which rounds to 19 men who have never been involved in a minor traffic accident.

According to a Published Study, 1 in Every 4 Men