i need solution for it on paper, solution which is complete i have posted it already but you guys just give explanation so this time please send complete solution on Paper

Suppose you are provided with the following data based on 5 years of monthly returns for three stocks. a) Calculate the James-Stein estimates of expected return on each of the portfolios. (7 marks) b) Explain the value of James-Stein estimator to a portfolio manager doing mean-variance optimisation