Statisticsmedium · Past Paper
The sum of 20 observations is 400. If the sum of first 10 is 150, what is the mean of the last 10?
A25
B20
C15
D30
✓ Correct Answer: A — 25
Sum of last 10 = 400 - 150 = 250. Mean = 250 / 10 = 25.
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