Calculating Returns and Variability $[$LO$1]$ 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?