You've observed the following returns on Pine Computer's stock over the past five years: 8 percent, 12 percent, 14 percent, 21 percent, and 16 percent. What was the arithmetic average return on the company's stock over this five-year period? What was the variance of the company's returns over this period? The standard deviation? Input oreo: (Use cells A6 to 111 from the given information to complete this question. You must wse the built-in Ercel function to answers this question. Make sure to wse the "sample" Ercel formulas.)