a) What is the expected value of the sample mean?

b) Can the Central Limit Theorem be applied in this case?

c) The probability that a sample mean is greater than 27 is 0.1587. Find n.

d) If the population followed a Chi-Squared distribution, how would you approach part c) of this question?

Is the expected value equal to the population mean? I guess I can use the central limit theorem, because the sample is 'large'. I have no idea how to tackle c), I probably need to somehow standardize it, but I dont know how. No clue about d) either. Help would be appreciated, thanks a lot.