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:
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.
The last one should be F instead of E:
F = 200 * .10 = ?
Sorry for any confusion.