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- Let X1,...,Xn be iid random sample from U(a,b), and a is known. Suppose that T1 and T2 are the UMVUE and MLE of parameter b, respectively. Find eff(T1,T2).There are two traffic lights on a commuter's route to from work. Let X1 be the number of lights at which the commuter must stop on his way to work, and X2 be the number of lights at which he must stop when returning from work. Suppose these two variables are independent each with pmf given in the accompanying table (so X1, X2 is a random sample of size n = 2). x1 0 1 2 p(x1) 0.2 0.5 0.3 μ=1.1,σ=0.49 a. Determine the pmf of T0=X1+X2