Please help me understand how to come to the answer above using formulas or a financial calculator if possible. Thanks.

6. Answer the questions below using the following information on stocks A, B, and C. Expected Return Standard Deviation Beta A 20% 12% 1.8 21% 10% 2.2 10% 10% 0.8 Assume the risk-free rate of return is 3% and the expected market return is 12%. If returns are normally distributed, then approximately two-thirds of the time the return on each stock will be? Answer: Stock A: 32% and 8% Stock B: 31% and 11% Stock C: 20% and 0%