You own a stock that had returns of $13\mathrm{.}30$ percent, $-16\mathrm{.}70$ percent, $22\mathrm{.}60$ percent. and $20\mathrm{.}80$ percent over the past four years. What was the arithmetic average return for this stock? What was the standard deviation of the returns? A$)10\mathrm{.}83\%,17\mathrm{.}71\%$B$)8\mathrm{.}73\%,15\mathrm{.}25\%$C$)8\mathrm{.}73\%,12\mathrm{.}40\%$ D$)10\mathrm{.}00\%,15\mathrm{.}71\%$E$)\mathrm{.}10\mathrm{.}00\%,18\mathrm{.}25\%$