Please help me

Part A Alex has found the following information about the share market: Stock Curlew Inc. Panda, Corp. Beta 0.5 2.5 Ex ected return 22% Alex knows that CAPM holds, so all assets in the market are fairly priced. What is the expected return on the market? Part B Jessica wants to use her savings to invest in the share market. She knows that the market portfolio has a standard deviation of 30 percent and an expected return of 15 percent. The risk-free rate is 8 percent. a) Calculate the expected return of a well-diversified portfolio with a standard deviation of 10 percent. b) Calculate the standard deviation of a well-diversified portfolio with an expected return of 25 percent.