Civil Service Exam Reviewer · Averages · hard
The average of 18 test scores was computed as 67. Later it was found that a score of 94 had been recorded as 78. What is the correct average?
- 66.11
- 67
- 83
- 67.89
Answer
D. 67.89
Solution
Wrong sum = 1206. Correct sum = 1206 − 78 + 94 = 1222. Correct average = 67.89.
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