You are a financial manager and have observed the following returns on Kam Steel Corporation stock over the past ten years: 7%, 12%, 11%, -38%, 14%, 22%, -26%, 18%, 20%, and 23%. Based on the given information, please answer questions a and b.

a) What was the arithmetic average return on Kam Steel Corporation stock over this 10-year period?

b) What was the variance of Kam Steel Corporation stock's returns over this period? The standard deviation?