What is the mean of the squares of the first 20 natural numbers? We k

| What is the mean of the squares of the first 20 natural numbers?

A. 151.5

B. 143.5

C. 65

D. 72

Right Answer is: B

SOLUTION

We know that sum of square of first n natural integers

S =

In this question n = 20

Mean of the squares of the first 20 natural numbers =

=

= 143.5

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