1. ## Poisson distribution

LEt X have a Poisson distribution with mean = 4. Show that

P(u -2sigma < X < u +2sigma) = .931

anyone know how i should go about starting this problem? stumped.

2. What is the CDF and standard deviation of the Poisson distribution?

3. moo, I mean $\mu=\sigma=4$

So calculate $P(4-8 for a Poisson with moo=4.

which is F(11) btw.