問題詳情
202. A representative of a market research firm contacts consumers by phone in order to
conduct surveys. The specific consumer contacted by each phone call is randomly
determined. The probability that a phone call produces a completed survey is 0.25.
Calculate the probability that more than three phone calls are required to produce one
completed survey.
(A) 0.32
(B) 0.42
(C) 0.44
(D) 0.56
(E) 0.58
參考答案
答案：B
統計：A:0,B:0,C:0,D:0,E:0
難度：計算中