Ten percent of the corporate managers at Axolotl Industries majored in humanities. What is the expected number of managers to be interviewed until finding the first one with a humanities major?
A)15
B)20
C)10
D)17

Question

Quizplus · Accepted Answer

The expected number of trials to get the first success in a geometric distribution is the reciprocal of the probability of success. Here, the probability of a manager having a humanities major is 0.10, so the expected number is 1/0.10 = 10.

Ten Percent of the Corporate Managers at Axolotl Industries Majored