Statisticshard · Past Paper
The mean of 20 observations is 15. On checking, it was found that two observations 20 and 15 were miscopied as 3 and 32. The correct mean is:
A15
B16
C14
D15.5
✓ Correct Answer: A — 15
Net change = (20+15) - (3+32) = 35 - 35 = 0. The mean remains 15.
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