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  1. The average of the squares of first ten natural numbers is
    1. 35.5
    2. 36
    3. 37.5
    4. 38.5
Correct Option: D

According to question ,

12 + 22 + 32 +........+ n2
n

=
(n + 1)(2n + 1)
6

Required average =
12 + 22 + 32 +........+ 102
10

Required average =
(10 + 1)(2 × 10 + 1)
6

Required average =
11 × 21
 = 38.5
6


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