1.a) Find the joint density of X1, X2, ..., Xn independent random variables sampled from the Gammala, B) distribution. b) Find the joint density of X1, X2, ..., Xn independent random variables sampled from the Normal(u, 02) distribution. 2. Let T1, T2, ..., Tn be independent random variables that are exponentially distributed with parameter 2. a) Find the PDF of the minimum of the n random variables. b) Find the PDF of the maximum of the n random variables.