Homework Help: statistics

Posted by Anonymous on Friday, April 20, 2012 at 11:05pm.

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

statistics - MathGuru, Saturday, April 21, 2012 at 11:28am
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.
Correction - MathGuru, Saturday, April 21, 2012 at 11:31am
The last one should be F instead of E:

F = 200 * .10 = ?

Sorry for any confusion.

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