Please solve and show your work.

Please include formula and how you got to the answer.

Please include reasoning.

Please show your work for A, B, and C.

2. Assume that the equity risk premium is normally distributed with a population mean of 9 percent and a population standard deviation of 25 percent. Over the last three years, equity returns (relative to the risk-free rate) have averaged -3.0 percent. You have a large client who is very upset and claims that results this poor should never occur. Evaluate your client's concerns. A) Construct a 90 percent confidence interval around the population mean for a sample of three-year returns. B) What is the probability of a -3.0 percent or lower average return over a three-year period? C) Your client claims an average return of 11 percent or higher is desirable, what is the probability of a 11 percent of higher average return over a three-year period