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