Post a New Question

Statistics 250

posted by on .

Final averages are typically approximately normally distributed with a mean of 65 and a standard deviation of 8. Your professor says that the top 10% of the class will receive an A; the next 20%, a B; the next 41%, a C; the next 19%, a D; and the bottom 10%, an F. (Give your answers correct to one decimal place.)

(a) What average must you exceed to obtain an A?

(b) What average must you exceed to receive a grade of C or better?

(c) What average must you obtain to pass the course? (You'll need a D or better.)

  • Statistics 250 - ,

    You need to learn how to use a normal probability distribution curve, or tables. There is one at

    I used it to get the following answers:
    (a) A score = 75.3 or better
    (b) C score or higher (top 71%) = 60.8
    (c) Passing D score or higher (top 90%) = 54.7

Answer This Question

First Name:
School Subject:

Related Questions

More Related Questions

Post a New Question