Hello! The answer to the first question is B. For standard normal distribution, e (x 2) = dx+(ex) 2 =1=1,so E (X 2+ 1) = E (X 2)+ 1. The answer to the second question is c, because EX is a constant, and its expectation is equal to this constant, that is, E[E(EX)]=E[EX]=EX. The economic mathematics team will help you solve the problem, please adopt it in time. thank you