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The average of the squares of the first 82 natural numbers is
Question

The average of the squares of the first 82 natural numbers is

A.

2281.5

B.

2283.5

C.

2284.5

D.

2282.5

Correct option is D

Given:
n = 82
Formula Used:
Average of squares of first n natural numbers = (n+1)(2n+1)6\frac{(n+1)(2n+1)}{6}​​
Solution:
Average=(82+1)(2×82+1)6=83×1656 Average=83×552=45652=2282.5Average = \frac{(82+1)(2 \times 82 + 1)}{6} = \frac{83 \times 165}{6}\\ \ \\Average = \frac{83 \times 55}{2} = \frac{4565}{2} = 2282.5​​
So the correct answer is (d)

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