Suppose $x$ Is a Random Variable for Which a Poisson Probability Distribution

Essay

Suppose $x$ is a random variable for which a Poisson probability distribution with $\lambda = 3$ provides a good approximation.
a. Graph $p ( x )$ for $x = 0,1,2,3,4,5,6$ .
b. Find $\mu$ and $\sigma$ for $x$ .
c. What is the probability that $x$ will fall in the interval $\mu \frac { \circ } { \sigma }$ ?