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I am stuck on this problem: Suppose the amount spent on cell phone service for WTCC students per month is normally distributed and has a

I am stuck on this problem:

Suppose the amount spent on cell phone service for WTCC students per month is normally distributed and has a mean of $78 and a standard deviation of $9.

  1. Most students' bills will be in the middle 95%. What is the lowest and highest bill for the middle 95%? Remember, we are talking about money here. [minBill] to [maxBill]

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