You$$ve observed the following returns on Crash$-$n$-$Burn Computer$$s stock over the past five years: $4$ percent, $15$ percent, $28$ percent, $18$ percent, and $14$ 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?

What was the standard deviation of the company$$s returns over this period?