You$$ve observed the following returns on Regina Computer$$s stock over the past five years: $12\%,9\%,20\%,17\%,$ and $10\%.$

a$.$ What was the arithmetic average return on Regina$$s stock over this five$-$year period? $($Round the final answer to $1$ decimal place.$)$

Average return

$\%$

b$-1.$ What was the variance of Regina$$s returns over this period? $($Do not round intermediate calculations. Round the final answer to $5$ decimal places.$)$

Variance

b$-2.$ What was the standard deviation of Regina$$s returns over this period? $($Do not round intermediate calculations. Round the final answer to $1$ decimal place.$)$

Standard deviation