The credit scores of 35-year-olds applying for a mortgage at Ulysses Mortgage Associates are normally distributed with a mean of 600 and a standard deviation of 100.
(a) Find the credit score that defines the upper 5 percent.
(b) Seventy-five percent of the customers will have a credit score higher than what value?
(c) Within what range would the middle 80 per- cent of credit scores lie?