You've observed the following returns on Mary Ann Data Corporation's stock over the past five years: $34$ percent, $16$ percent, $19$

percent, $-21$ percent, and $8$ percent.

a$.$ What was the arithmetic average return on Mary Ann's stock over this five$-$year period? $($Do not round intermediate calculations.

Round the final answer to $2$ decimal places.$)$

Arithmetic average return

$\%$

b$-1.$ What was the variance of Mary Ann's returns over this period? $($Do not round intermediate calculations. Round the final answer

to $6$ decimal places.$)$

Variance

b$-2.$ What was the standard deviation? $($Do not round intermediate calculations. Round the final answer to $2$ decimal places.$)$