Finacial managment help

You are considering two possible investments (X and Y) with returns and related probabilities are as follows:

Calculate the expected return, standard deviation, and coefficient of variation for each and determine which security will be preferred.

Part 2

1. A company has beta = 1.8, the risk-free rate is 7%, and the market risk premium is 11%. What will be the required rate of return of company?
2. A company has required rate of return of 12%, the risk-free rate is 4%, and the market return is 11.5%. What will be the company's beta?
3. A stock has a beta of 0.85, the risk-free rate is 5.50%, and the market risk premium is 4.0%. What is the stock's required rate of return?

Part 3

Two projects with the following cash flows are being considered:

Calculate the payback period, NPV, and IRR and determine which projects should be considered for mutually exclusive and for independent projects. The discount rate for both projects is 11.50%.