Find the Standard Deviation $\sigma$ , for the Binomial Distribution Which Has the Stated Values

Multiple Choice

Find the standard deviation, $\sigma$ , for the binomial distribution which has the stated values of n and p . Round your answer to the nearest hundredth.
n=38 ; p=2 / 5

A) $\sigma = 0.61$
B) $\sigma = 6.29$
C) $\sigma = 3.02$
D) $\sigma = 7.14$