# Probability using Poisson Distribution

1. Jan 29, 2009

### FourierX

1. The problem statement, all variables and given/known data

Suppose a typographical errors committed by a typesetter occurs randomly. If that a book of 600 pages contains 600 such errors, calculate the probability by using Poisson's distribution.
i) that a page contains no errors
ii) that a page contains at least three errors

2. Relevant equations

W(n) = $$\lambda$$n e -$$\lambda$$ / n!

3. The attempt at a solution

I related $$\lambda$$ = Np, the mean number of errors and proceeded. I am supposed to get 0.37 for part i) of the problem but I didn't get it right. Any suggestion?

Berkeley

2. Jan 29, 2009

### Staff: Mentor

Isn't lambda the mean number of errors per page? If so, it would be 1. Using the formula, W(0) = 1^0 * e^(-1)/0! = 1/e ~ .37