"After a tumultuous period in the stock​ market, Logan Morgan is considering an investment in one of two portfolios. Given the information that​ follows, which investment is​ better, based on risk​ (as measured by the standard​ deviation) and return as measured by the expected rate of​ return?" Portfolio A Portfolio B
Probability Return Probability Return
0.22 -4% 0.08 3%
0.50 20% 0.25 10%
0.28 23% 0.38 13%
0.29 17%

a. The expected rate of return for portfolio A:
b. The standard deviation of portfolio A is:
c. The expected rate of return for portfolio B is:
d. The standard deviation of portfolio B is: