Civil Service Exam Reviewer · Averages · hard
In a 10-item quiz, the scores and number of students were: 5 (5), 6 (8), 7 (4), 8 (2), 9 (1), 10 (2). What is the mean score?
- 7.5
- 24.33
- 7.14
- 6.64
Answer
D. 6.64
Solution
Σ(score × frequency) = 146; total students = 22. Mean = 146 ÷ 22 = 6.64.
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