Over the past five years, Redstone Enterprises produced returns of 31%, 38%, -41%, 8%, and 15%. The mean of these returns is _____% and the standard deviation is _____%.

Select one:

a. 10.2; 31.04

b. 10.2; 35.85

c. 26.6; 27.77

d. 26.6; 31.04

e. 10.2; 27.77