The historical stock returns for TechFluent, Inc. are shown below:

Year

$1$

$2$

$3$

$4$

Return

$0\%$

$-14\%$

$15\%$

$31\%$

What is the standard deviation of returns for TechFluent, Inc. stock over this $4-$year period. $($Compute the standard deviation assuming this is a population of returns, not a sample $-$ that is$,$ use the procedure described in the textbook for calculating the standard deviation of a series of stock returns$).$