Statisticsmedium · Past Paper
If the mean of a group of observations is 50, and later it's discovered that an observation of 60 was misread as 40, what will happen to the mean after correction?
AIncrease
BDecrease
CRemain constant
DBecome zero
✓ Correct Answer: A — Increase
Since the actual value (60) is greater than the misread value (40), the sum will increase, thus increasing the mean.
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