Statisticsmedium · Past Paper
The mean of 100 observations is 50. If one observation 50 is replaced by 150, what is the new mean?
A50
B51
C52
D60
✓ Correct Answer: B — 51
Sum increases by (150 - 50) = 100. New Mean = (Original Sum + 100) / 100 = (5000 + 100) / 100 = 51.
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