1.     A textbook copy editor is reviewing a manuscript for grammatical errors. Let the random variable       X represent the number of grammatical errors made in a particular chapter. Assume that the conditions of a Poisson distribution are satisfied with an average of ten grammatical errors per chapter.

a. What is the probability that X is less than three?

b. What is the probability that X is greater than one?

c. What is the mean value of X?

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