A+N, where A can be 1 or -1 and N has a uniform distribution on [1.5, 1.5], yielding the conditional density functions fDA=1= -0.5 < x < 2.5 -2.5 << 0.5 fD|A=-1= otherwise. 10 otherwise. Find the probability of an error using the optimum decision rule assuming the two alternatives for A are equally likely. A+N