You've observed the following returns on Crash$-$n$-$Burn Computer's stock over the past

five years: $5$ percent, $-12$ percent, $28$ percent, $17$ percent, and $18$ percent.

What was the arithmetic average return on the company's stock over this five$-$year

perlod?

Average return

What was the varlance of the company's returns over this period?

Variance

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

Standard deviation