Find the indicated probabilities using the geometric distribution, the Poisson distribution, or the binomial distribution. Then determine if the events are unusual. If convenient, use the appropriate probability table or technology to find the probabilities.A newspaper finds that the mean number of typographical errors per page is 5. Find the probability that (a) exactly 4 typographical errors are found on a page, (b) at most 4 typographical errors are found on a page, and (c) more than 4 typographical errors are found on a page.

(a) P = 4 typographical errors are found on a page) equals = ______(Round to four decimal places as needed.)