What is the average of the squares of first 14 natural numbers?
Show answer & explanation
Correct answer: C
Explanation
Given:
n = 14
According to the formula:
∑n² = n(n+1)(2n+1)/6
Average = ∑n² / n
∑n² = 14 × 15 × 29 / 6 = 1015
Average = 1015 / 14 = 72.5