What is the mean of the squares of the first 20 natural numbers?
| What is the mean of the squares of the first 20 natural numbers?
A. 151.5
B. 143.5
C. 65
D. 72
Please scroll down to see the correct answer and solution guide.
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
