20 May (A) Find The Credit Score That Defines The Upper 20 Percent.
The credit scores of 35-year-olds applying for a mortgage at Ulysses Mortgage Associates are normally distributed with a mean of 620 and a standard deviation of 90.
(a)
Find the credit score that defines the upper 20 percent. (Use Excel or Appendix C for calculation of z-value. Round your final answer to 2 decimal places.)
Credit score
(b)
Eighty-five percent of the customers will have a credit score higher than what value? (Use Excel or Appendix C for calculation of z-value. Round your final answer to 2 decimal places.)
Credit score
(c)
Within what range would the middle 90 percent of credit scores lie? (Use Excel or Appendix C for calculation of z-value. Round your final answer to 2 decimal places.)
Range to
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