Please provide step $-$ by $-$ step solution that you can do on Excel or on paper.Need explaination. If on excel show step by step on how to do on excelYou invest in a stock for $4$ years and achieve the following rates of return. The arithmetic average return over the $4$ year period is $3\mathrm{.}11\%.$ What is the standard deviation of returns?

$\backslash$table$[[$Year$,$Return$],[1,19\mathrm{.}1\%$