求解答图中题目并求详细过程
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E(X)
= (0)(0.7)+(1)(0.2)+(2)(0.1)
=0.4
E(X^2)
= (0^2).(0.7)+(1^2)(0.2)+(2^2)(0.1)
=0.6
D(X)=E(X^2)-[E(X)]^2 = 0.6 - 0.4^2 =0.44
= (0)(0.7)+(1)(0.2)+(2)(0.1)
=0.4
E(X^2)
= (0^2).(0.7)+(1^2)(0.2)+(2^2)(0.1)
=0.6
D(X)=E(X^2)-[E(X)]^2 = 0.6 - 0.4^2 =0.44
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