Find the indicated probabilities using the geometricdistribution, the Poissondistribution, or the binomial distribution. Then determine if the events are unusual. Ifconvenient, use the appropriate probability table or technology to find the probabilities.

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