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Suppose the length of a chapter of a Harry Potter book, in words, is approximately normally...

Suppose the length of a chapter of a Harry Potter book, in words, is approximately normally distributed. Chapters are known to have an average length of 4580 words, with a standard deviation of 120 words. About what percent of Harry Potter chapters have between 4460 and 4700 words? About what percent of Harry Potter chapters have more than 4820 words? About what percent of Harry Potter chapters have more than 4220 words?

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