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A credit score measures a person's creditworthiness. Assume the average credit score for Americans is 709 . Assume the scores are normally distributed with a

A credit score measures a person's creditworthiness. Assume the average credit score for Americans is 709.

Assume the scores are normally distributed with a standard deviation of 55.

a) Determine the interval of credit scores that are one standard deviation around the mean.

b) Determine the interval of credit scores that are two standard deviations around the mean.

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