A course has 2 sections, Section A and Section B.

Phoebe Xiong

Phoebe Xiong

Answered question

2022-03-01

A course has 2 sections, Section A and Section B. On the last exam, Section A's 10 students had an average score of 80, and Section B's 20 students had an average score of 90. What is the course average score on that exam?

Answer & Explanation

Athena Hussain

Athena Hussain

Beginner2022-03-02Added 5 answers

You can't just take the mean. It has to a weighed mean.
First back to basics:
Section A having an average of 80 means they scored a total of 10*80=800 points
Section B scored 20*90=1800 points
Total score for 30 students is 800+1800=2600
The average score: 260030=862386.7 points
Extra:
The other way is to realise that 10 is 1/3 of the total number of students in the course. And 20 is 2/3
So we weigh the average for section A and B accordingly:
Total average=
1380+2390=803+2903=2603=862386.7

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