statistics

Dr. Snyder teaches a large introductory statistics course. In the past, the proportion of students that receive a grade of A is 0.20. The proportion that receives a B is 0.30. The proportion that receives a C is 0.30. The proportion that receives a D is 0.10. The proportion that receives an F is 0.10. This year, there were 200 students in the class and they received the following grades.
A B C D F
Number 56 74 60 9 1

The expected numbers of counts are for A,B,C,D,E:
Answer

asked by Anonymous
  1. Multiply each proportion by 200:

    A = 200 * .20 = ?
    B = 200 * .30 = ?
    C = 200 * .30 = ?
    D = 200 * .10 = ?
    E = 200 * .10 = ?

    I'll let you finish the calculations.

    posted by MathGuru
  2. The last one should be F instead of E:

    F = 200 * .10 = ?

    Sorry for any confusion.

    posted by MathGuru

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