Statisticsmedium · Past Paper
The arithmetic mean of 1, 2, 3, ... n is:
An/2
B(n+1)/2
Cn(n+1)/2
D(n-1)/2
✓ Correct Answer: B — (n+1)/2
Sum of first n natural numbers is n(n+1)/2. Mean = Sum / n = [n(n+1)/2] / n = (n+1)/2.
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