問題詳情
5.Assume the miles-per-gallon of the model Q cars is distributed with a mean of 22 miles-per-gallon and a standarddeviation of 12 miles- per-gallbn. 36 model Q cars are sampled.
【題組】
(A).What is the probability that mean miles-per-gallon of the 36 cars will get less than 21 miles-per-gallon?
參考答案
答案：C
難度：非常簡單0.940984
統計：A(2),B(45),C(1148),D(0),E(0)