Civil Service Exam Reviewer · Averages · hard
In a 10-item quiz, the scores and number of students were: 5 (3), 6 (3), 7 (2), 8 (7), 9 (1), 10 (1). What is the mean score?
- 7.5
- 20.33
- 7.68
- 7.18
Answer
D. 7.18
Solution
Σ(score × frequency) = 122; total students = 17. Mean = 122 ÷ 17 = 7.18.
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