Based on the information given below the standard deviation would be:

Rate of Return

Probability

$20\%$

$0\mathrm{.}25$

$0\%$

$0\mathrm{.}30$

$+20\%$

$0\mathrm{.}25$

$+40\%$

$0\mathrm{.}20$

Question $31$ options:

$18\mathrm{.}36\%$

$456\%$

$2\mathrm{.}2\%$

$21\mathrm{.}4\%$