solving probability question John Smith 4 years ago X is a random variable with f(x) = cxe~2x, for 0 < x < oo. Here c is some positive constant. 1. What is the value of c? 2. Find E[5X + 1]. 3. Find Var [AX + 2]. 4. Consider Y ~ Uni([l, 5]). What is the 75% quantile of Y?