The mean of 100 observations was calculated as 40. It was later found that an observation 53 was misread as 83. Find the correct mean.
A39.3
B39.7
C40.3
D40.7
Explanation
Total error = 83 – 53 = 30 (excess). Correct sum = (100 * 40) – 30 = 4000 – 30 = 3970. Correct mean = 3970 / 100 = 39.7.
Exam Relevance
- Topic: Statistics
- Subtopic: Corrected Mean
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