Macro Corporation Has Had the Following Returns for the Past $\left( r _ { m } \right)$

Multiple Choice

Macro Corporation has had the following returns for the past three years: -10 percent, 10 percent, and 30 percent.Use the following formulas to calculate the standard deviation of the returns: Variance = expected value of $\left( r _ { m } \right)$ $\left( \tilde { r } _ { m } - r _ { m } \right) ^ { 2 }$ Standard deviation of . $\tilde { r } _ { m } = \sqrt { \text { variance } \left( r _ { m } \right) }$

A) 10.00 percent
B) 16.33 percent
C) 18.21 percent
D) 30.00 percent