设随机变量X的分布律为 X -2 0 2 P 0.4 0.3 0.3 则E(3X 2 +5)=( )
A.
-0.2
B.
2.8
C.
6.4
D.
13.4
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【简答题】Joshua Lionel Cowen,a New York inventor,was born in l 877.In 1 900,he created maybe the most popular Christmas toy of the last century —little electric trains that circle Christmas trees.More than 50 ...