試題詳解

15. An insurance company determines that N, the number of claims received in a week, is a random variable with P[N=n]= where n ≥ 0 . The company also determines that the number of claims received in a given week is independent of the number of claims received in any other week.
Calculate the probability that exactly seven claims will be received during a given two-week period.
(A) 1/256
(B) 1/128
(C) 7/512
(D) 1/64
(E) 1/32