2. Equate the integral of the pdf to 1 and solve for k. What have you tried and where are you stuck?

3. Calculate Pr(X = 0) + Pr(X = 1) + Pr(X = 2) + Pr(X = 3). Each term is calcultaed from the pmf of the Poisson distribution and you're given the mean. What have yuo tried and where do you get stuck.

(Someone else can look at 1. - I'm tired of urn problems).