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 three. Find the probability that (a) exactly four typographical errors are found on a page, (b) at most four typographical errors are found on a page, and (c) more than four typographical errors are found on a page.

(a) P(exactly four

typographical errors are found on a page

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