For which α is the variance of a Par (α) distribution finite? Compute the variance for these α. 25. Let X have an exponential distribution with parameter λ.  a. Determine E[X] and E X2 using partial...

For which α is the variance of a Par (α) distribution finite? Compute the variance for these α.

25. Let X have an exponential distribution with parameter λ.

 a. Determine E[X] and E X2 using partial integration.

 b. Determine Var(X).