Suppose a Poisson Probability Distribution With $\lambda = 8.3$ Provides a Good Approximation of the Distribution of a Random

Multiple Choice

Suppose a Poisson probability distribution with $\lambda = 8.3$ provides a good approximation of the distribution of a random variable $x$ . Find $\sigma$ for $x$ .

A) $8.3$
B) $68.89$
C) $\sqrt { 8.3 }$
D) $4.2$