The mean and standard deviation of the expected returns of a stock is estimated at 7.5% and 6.30%, respectively. Assuming returns are normally distributed, what is the range of expected returns a the 99% level of confidence (CI)? Use z=2.58 for 99% confidence level. -4.24% to 15.24% -11.77% to 20.77% -8.75% to 23.75% -3.18% to 16.18%