stuck with hw problem

Problem 3: A cumulative distribution function of X is given as following F(z)=1s'(1'\"l, m as, a 2:0. 3 :> 0 (a) Please show that Y = [95 follows an exponential distribution. (b) Write a function to generate 100.000 random numbers with or = 2 and 6 = 4, and plot the histogram