(a) A statistical instructor has observed that the number of typographical errors in new editions of textbooks varies considerably from book to book. After some analysis, he concludes that the number of errors is Poisson distributed with a mean of 1.5 per 100 pages. The instructor randomly selects 100 pages of new book. What is the probability that there are no typographical errors? (b) Refer to (a). Suppose that the instructor has just received a copy of a new statistics book. He notices that there are 400 pages. i) What is the probability that there are no typos? ji) What is the probability that there are five or fewer typos?

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