Mac Inc., which was created in 1962, has yielded the following percentage returns on its stock for the last 5 years: 13.2, 5.0, 10.2, 7.5, and 12 .9.
1. Calculate the mean percentage return for Mac Inc.
2. Calculate the standard deviation of the returns.
3. What percentage return should investors in Mac expect for next year?
4. What is the worst return investors in Mac should expect for next year?