Question

A class has 3 sections. Here is a summary of the scores on the final exam.

Average SD Number of Students
Section 1 68 9 20
Section 2 75 9 25
Section 3 60 9 32

Find the average score of all the students in the class.

Answer 1

Mean = ∑x/n --> n(mean) = ∑x

(68*20) + (75*25) + (60*32) = ?

Divide that by 20 + 25 + 32 = ?

Answer 2

Thanks I got it