尤其第一问愣没看懂，完全没有思路，哪位大侠能帮忙看看：1. Let X be a random variable with pdf f(x)=b^2*x*e^(-bx) for x>0 and 0 otherwise, where b>0.
1) find the quantile of order p, 0<p<1
2) find the moment generating function of X
3) find the pdf of Y=(X-2/b)^2

谢谢