A book editor was proofreading a draft of a novel. She found that the number of errors on each page of the book was normally

Question

A book editor was proofreading a draft of a novel. She found that the number of errors on each page of the book was normally distributed, with the mean number of errors on a page as 15 and a standard deviation of 2. If 102 pages had between 11 and 15 errors, what was the approximate total number of pages in the book?

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