問題詳情

9.The life time (in years) of a kind of light bulb has the exponential distribution
(i)What are the mean and variance of the life time of tliis kind of light bulb.

參考答案

答案:D
難度:非常簡單0.962567
統計:A(4),B(0),C(8),D(360),E(0)

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