問題詳情

150. A theme park conducts a study of families that visit the park during a year. The fraction of such families of size m is

, m = 1, 2, 3, 4, 5, 6, and 7.

For a family of size m that visits the park, the number of members of the family that ride the roller coaster follows a discrete uniform distribution on the set {1, … , m}.

Calculate the probability that a family visiting the park has exactly six members, given that exactly five members of the family ride the roller coaster.
(A) 0.17
(B) 0.21
(C) 0.24
(D) 0.28
(E) 0.31

參考答案

答案:E

統計:A:0,B:0,C:0,D:0,E:0

難度:計算中