4. 某公司往返台北與新竹之長途巴士,其每班車每趟之載客人數的機率分配如下表: 若單程票價為100元,且定義隨機變數為每班車每趟之票價收入,試問E(Y)與V(Y)各為何? (8%)

(2). Seventy-five percent of the graduates of a driver training school pass the official driver's test on the first attempt, and the other 25 percent fail. The school gives a pretest to graduates before they take the official test. Of the graduates who pass the official test on the first attempt, 90% passed the pretest. Of the graduates who fail the official test on the first attempt, 20% passed the pretest.We wish to know the probability that a graduate can pass the official test on the first attempt, given that he passed the school pretest. (6%)

4. 某公司往返台北與新竹之長途巴士,其每班車每趟之載客人數的機率分配如
下表:

若單程票價為100元,且定義隨機變數為每班車每趟之票價收入,試問E(Y)與V(Y)各為何? (8%)

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