Find the indicated probabilities using the geometric distribution, the Poisson distribution, or the binomial distribution. Then determine if the evens are unusual.

A newspaper finds that the mean number of typographical errors per page is nine. Find the probability that (a) exactly 6 typographical errors are found on a page, (b) at most 6 typographical errors are found on a page, and (c) more than 6 typographical errors are found on a page.