You purchased common shares for $66.96 each, which pay a cash dividend of $3.25 per year. The annual returns on the investment over the past 6 years was: 5%, 6%, 4%, 2%, (4%), and 5%. The arithmetic mean of your returns was _____ and its standard deviation was ____.

Select one: a. 5.83%; 7.47% b. 3.17%; 8.658% c. 3.00%; 3.69% d. 5.67%; 18.15% e. 4.67%; 12.24%