Problem 5 of 25sta-005
A table lists quiz scores and how many students earned each: score 5, 1 student; score 6, 2 students; score 8, 3 students; score 9, 4 students. What is the mean score?
Try it first
The walkthrough opens once you check an answer.
Solution walkthrough1:33
- Each dot is one student. A score earned by several students counts once for every one of them.
- Multiply each score by its count: , , , .
- Total points: . Students: .
- Mean total points students .
- Traps: averages the four scores and ignores the counts, averages the counts, and is the mode.