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.
- $\mathrm { n } = 42 ; \mathrm { p } = 3 / 5$

A) $\sigma = 3.17$
B) $\sigma = 7.29$
C) $\sigma = 0.76$
D) $\sigma = 6.44$