Let {N(t):t>=0} be a poisson process of rate 1 and let T1 < T2 <... denote the times of the points. Derive the pdf of Y=T1/T3 and obtain E(Y).

Let X,Y be iid N(0,1). Derive the pdf of W=|x|/Y.

Could someone please help me with this kind of pdf questions?

Thanks a lot!