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44.假設某種昆蟲的身長 X 及重量 Y 符合二維常態分佈,其中期望值分別是 EX=40 及 EY=20, 而變異數都是 6,相關係數為 0.7,為了實驗需求,某人只蒐集重量 Y=22 的該類昆蟲,在
問題詳情
44.假設某種昆蟲的身長 X 及重量 Y 符合二維常態分佈,其中期望值分別是 EX=40 及 EY=20, 而變異數都是 6,相關係數為 0.7,為了實驗需求,某人只蒐集重量 Y=22 的該類昆蟲,在此條件下,有關昆蟲身長的分佈,下列敘述何者正確?
(A)期望值為 38.6
(B)標準差大於 2
(C)期望值為 40
(D)期望值為 41.4
參考答案
答案:D
難度:
計算中
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