Statisticsmedium · Past Paper
If the sum of 10 observations is 150 and the mean of 5 of them is 10, what is the mean of the remaining 5?
A10
B20
C25
D15
✓ Correct Answer: B — 20
Total sum = 150. Sum of first 5 = 5 * 10 = 50. Sum of remaining 5 = 150 - 50 = 100. Mean = 100/5 = 20.
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