試題詳解

271. In one company, 30% of men and 20% of women contribute to a supplemental retirement plan. Furthermore, 45% of the company’s employees are women.

 Calculate the probability that a randomly selected employee is a woman, given that this employee contributes to a supplemental retirement plan.
(A) 0.09
(B) 0.23
(C) 0.35
(D) 0.45
(E) 0.55