Suppose a Poisson Probability Distribution With $\lambda = 6.3$ Provides a Good Approximation of the Distribution of a Random

Multiple Choice

Suppose a Poisson probability distribution with $\lambda = 6.3$ provides a good approximation of the distribution of a random variable $x$ . Find $\sigma$ for $x$ .

A) $3.2$
B) $6.3$
C) $\sqrt { 6.3 }$
D) $39.69$