Consider the following five monthly returns: 8% 1% 9% 12% 4% a. Calculate the arithmetic average monthly return over this period and express your answer as a percentage per month. b. Calculate the geometric average monthly return over this period. c. Calculate the monthly variance over this period. d. Calculate the monthly standard deviation over this period. Question content area bottom Part 1 a. The arithmetic average is 4.84.8%. (Round to two decimal places.) Part 2 b. The geometric average is enter your response here%. (Round to two decimal places.) please answer all parts