You find a certain stock that had returns of $14\mathrm{.}4$ percent, $22\mathrm{.}2$ percent, $28\mathrm{.}2$ percent, and $19\mathrm{.}2$ percent for four of the last five years. Assume the average return of the stock over this period was $12\mathrm{.}4$ percent.

What was the stock$$s return for the missing year?

Note: Do not round intermediate calculations and enter your answer as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.$

What is the standard deviation of the stock$$s returns?

Note: Do not round intermediate calculations and enter your answer as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.$