The credit scores of 35-year-olds applying for a mortgage at Ulysses Mortgage Associates are normally distributed with a mean of 660 and a standard deviation of 100. (a) Find the credit score that defines the upper 10 percent. (Use Excel or Appendix C to calculate the z-value. Round your final answer to 2 decimal places.) Credit score (b) Sixty-five percent of the customers will have a credit score higher than what value