What is the standard deviation of Amazon stock based on Table $1?$

Table $1$

State of Economy

Probability

Rate of Return

Boom

$20\%$

$16\%$

Normal

$60\%$

$11\%$

Recession

$20\%$

$-8\%$

Group of answer choices

$8\%$

$10\%$

$7\%$

$6\%$

$5\%$

$9\%$