Question: calculating returns and variability. You've observed the following returns on Barnett Corporation's stocks over the past five years: -12 percent, 23 percent, 18 percent, 7

calculating returns and variability. You've observed the following returns on Barnett Corporation's stocks over the past five years: -12 percent, 23 percent, 18 percent, 7 percent, and 13 percent.

a. What was the arithmetic average return on the stock over this five year period?

b. What was the variance of the returns over this period? the standard deviation?

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