Statisticshard · Past Paper
The mean of 100 observations was calculated as 40. Later it was found that an observation 53 was misread as 83. The corrected mean is:
A39.7
B40.3
C39
D41
✓ Correct Answer: A — 39.7
Total sum = 4000. Corrected sum = 4000 - 83 + 53 = 3970. Corrected mean = 3970/100 = 39.7.
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