Civil Service Exam Reviewer · Averages · hard
In a 10-item quiz, the scores and number of students were: 5 (6), 6 (3), 7 (9), 8 (3), 9 (6), 10 (1). What is the mean score?
- 7.5
- 7.11
- 33.17
- 7.61
Answer
B. 7.11
Solution
Σ(score × frequency) = 199; total students = 28. Mean = 199 ÷ 28 = 7.11.
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