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The number of days (X) after mailout it takes a utility company to receive payment for a customer's bill is a normal random variable with

The number of days (X) after mailout it takes a utility company to receive payment for a customer's bill is a normal random variable with a mean of 31 days and a standard deviation of 6 days.

The probability is 0.997 that a bill will be received between which of the following number of days?

(13, 49)
(19, 43)
(25, 37)

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