Please show the math behind each answer thanks! Investor A has a portfolio average 15% with a beta of 1.3 Investor B Has a portfolio average of 11%...

Please show the math behind each answer thanks!

Investor A has a portfolio average 15% with a beta of 1.3

Investor B Has a portfolio average of 11% with a beta of 1

Risk Free Rate is 5%

A . Can you tell which portfolio held the better selection of stocks?

B. If the market return was 10% who was a better selector of stocks?

C. If the beta for investor A was 1.7 would the answer to question B change, if yes then why?