試題詳解

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