Mathematics
Senior High
P(X=k)=nCkp^k(1-p)^(n-k)とする.以下の式をpで表せ.
(1)Σ[k=0〜n]kP(X=k)
(2)E({X-E(X)}^2)ただしE(X)= Σ[k=0〜n]kP(X=k)
教えてください.
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