Civil Service Exam Reviewer · Averages · hard
In a 10-item quiz, the scores and number of students were: 5 (8), 6 (8), 7 (7), 8 (2), 9 (1), 10 (9). What is the mean score?
- 7.5
- 7.2
- 42
- 7.7
Answer
B. 7.2
Solution
Σ(score × frequency) = 252; total students = 35. Mean = 252 ÷ 35 = 7.2.
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