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【单选题】
According to the passage, body temperature________A.
plays a vital role in selecting people for alternative day and night shifts
B.
changes every two hours during the day and every three hours during the night
C.
has been used for industries in selecting people for alternative shifts
D.
changes after a person has finished the training for alternative shifts
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【简答题】设随机变量X～N(2，σ 2 )，且P(2＜X＜4)=0.3，则P(X＜0)=______．
【简答题】设随机变量X～N(-1，σ 2 )，且P{-3＜X＜-1}=0.4，求P{X＞1}．
【简答题】设随机变量X～b(n， )，且P{x=2}=P{X=3}，则P{x=7}=( )．
【简答题】设随机变量X服从正态分布N(2，σ 2 )，且P{2＜X＜4}=0.3，求P{X＜0}．
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