In a large section of a statistics class, the points for the final exam are normally distributed, with a mean of 72 and a standard deviation of 9. Grades are to be assigned according to the following rule:

  • The top 10% receive A’s.
  • The next 20% receive B’s.
  • The middle 40% receive C’s.
  • The next 20% received D’s.
  • The bottom 10% receive F’s.

    Find the lowest score on the final exam that would qualify a student for an A, a B, a C, and a D. (Round your answers to two decimal places.)

    Final Exam GradesAND20OK1El4080BOB APoints scored on final examFIGURE FOR EXERCISE 42

"Get 15% discount on your first 3 orders with us"
Use the following coupon

Order Now