You$$ve observed the following returns on Pine Computers$$s stock over the past five years: $8$ percent, $12$ percent, $14$ percent, $21$ percent, and $16$ percent

a$.$ What was the arithmetic average return on the company$$s stock over this $5-$year period? $($Do not round intermediate calculations and enter your answer as a percent rounded to $1$ decimal place, e$.$g$.,32\mathrm{.}1.)$

b$-1.$ What was the variance of the company's returns over this period? $($Do not round intermediate calculations and enter your variance answer as a decimal $($not as a percent$)$ rounded to $5$ decimal places, e$.$g$.,\mathrm{.}16161.)$

b$-2.$ What was the standard deviation of the company$$s returns over this period? $($Do not round intermediate calculations and enter your answer as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$