NDA 2025 · PYQ · Statistics / Arithmetic mean · easy
What is the arithmetic mean of 8^2, 9^2, 10^2, ..., 15^2?
- A.133.5
- B.135.5
- C.137.5✓ Correct
- D.139.5
The terms are 64, 81, 100, 121, 144, 169, 196, 225. There are 8 terms. Sum = 64+81+100+121+144+169+196+225. Computing: 64+81=145; 145+100=245; 245+121=366; 366+144=510; 510+169=679; 679+196=875; 875+225=1100. Mean = 1100/8 = 137.5.
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