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1.

一電腦販賣商以每台$800買進某一型電腦4台，以每台$1500賣出；在一定時間後，製造商同意以每台$250回收尚未賣出的電腦。假設X = 賣出的電腦數，其賣出機率函數PMF = f(x)，若f(0)=0.1，f(1)=0.2，f(2)=0.25，f(3)=0.3，f(4)=0.15；
(a) 試問賣出的電腦數之期望值及標準差？__________；_________
(b) 試問穫利之期望值及標準差？__________；__________

還有這題

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禮拜四要期末考 麻煩各位幫我解答讓我有一些參考的資料面對考試

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