Question

The random variable X is Poisson dist. with mean m and satisfies
P(X=0) + P(x=1) - P(X=4)=0
a) find value of m
b) hence calculate P(2<=X<=4)

I have found the mean to be 3.1612. but I cannot figure out the second part. I thought that the question wanted me to find the conditional probability, so I tried doing P(X=>2)/PX<=4), but it didn't work.

Answer 1

@iGreen @iambatman help please? :)