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Mortgages In a random sample of 18 months from January 2011 through December 2020 the...

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Mortgages In a random sample of 18 months from January 2011 through December 2020 the mean interest rate for 30 year fixed rate home mortgages was 3 95 and the standard deviation was 0 49 Assume the interest rates are normally distributed Source Freddie Mac

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