设随机变量X的概率密度为f(x)={cxα,0≤x≤1,{0,其他且E(X)=0.75,求常数c和α.
E(X)=∫10cxα•xdx=c/(α+2)=0.75 ∫+∞-∞f(x)dx=∫10cxαdx=c/(α+1)=1 所以 α=2,c=3
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