the whole question

3. Assume r(1) are random samples and follows NV(0.1, 1) and P1 = 0.5. Please calculate (1) P(P, > 0.5); (2) Er(2); (3) P(PA > P2); (4) (Op- tional) to which is the smallest t such that P(P. > 0.5) > 0.8