Let have have the p.d.f. f(x) = (2 / square root of 2pi) * e^ (-x^2 / 2)...

babyfloyd85

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...from 0 < x < infinity.? Find the mean and variance of X.
Hint: Compute E(X) directly and evaluate E(X^2) by comparing its integral to the variance of N(0,1) or use a CAS.
 
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