Homework Help: Lottery probability

1. Feb 22, 2009

superwolf

Probability question

How do I solve

(m t) >= 8.26E6

?

Last edited: Feb 22, 2009
2. Feb 22, 2009

ToxicBug

I guess that you can represent it by a Poisson since N is large. I think that a Binomial( 1.859E-7, 19million) would describe X more accurately.

If it were a binomial, then the expected value would be np = 19mil*1.859e-7. Your Poisson needs to have the same expected value, and since Poisson has only one parameter, lambda, which represents both the expected value and the variance, you know the answer.

3. Feb 22, 2009

superwolf

Thanks, I solved it and changed the topic.

4. Feb 22, 2009

ToxicBug

I don't understand the question

5. Feb 23, 2009

HallsofIvy

Re: Probability question

Without knowing what "(m, t)" means, I don't see how anyone can help!