Mathematics, 16.07.2020 04:01 fayth1760
Suppose E(X) = 5 and E[X(X-1)] = 27.5. What is E(X2)? V(X)? The general relationship among the quantities E(X), E[X(X-1)], and V(X)?
Answers: 2
![E(X^2)=32.5\\V(X)=7.5\\E[X(X-1)]=E(X^2)-E(X)\\V(X)=E(X^2)-[E(X)]^2](/tpl/images/0707/6537/e11f4.png)
![E( X + Y ) = E(X) + E(Y)\\V(X) = E(X^2)-[E(X)]^2](/tpl/images/0707/6537/a1d30.png)
, we get:
by 5 and 
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Suppose E(X) = 5 and E[X(X-1)] = 27.5. What is E(X2)? V(X)? The general relationship among the quant...
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