問題詳情
9.The life time (in years) of a kind of light bulb has the exponential distribution
【題組】(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)
用户評論
【用戶】米開
【年級】高一下
【評論內容】答案正確嗎?為什麼不是習得無助感?