Question : What is the average of the squares of the first five natural numbers?
Option 1: 11.5
Option 2: 10
Option 3: 12.5
Option 4: 11
New: SSC MTS Tier 1 Answer key 2024 out
Don't Miss: Month-wise Current Affairs | Upcoming Government Exams
New: Unlock 10% OFF on PTE Academic. Use Code: 'C360SPL10'
Correct Answer: 11
Solution : The sum of the square of first $n$ natural numbers = $\frac{n(n+1)(2n+1)}{6}$, where $n$ is the number of numbers. Here, $n = 5$ ⇒ Sum = $\frac{5(5+1)(10+1)}{6}=\frac{5(6)(11)}{6}=55$ $\therefore$ Average $=\frac{55}{5}=11$ Hence, the correct answer is 11.
Answer Key | Cutoff | Selection Process | Preparation Tips | Eligibility | Application | Exam Pattern
Question : What is the average of first 10 natural numbers?
Question : What is the average of the first 10 even numbers?
Question : The average of five consecutive odd numbers is 15. What is the smallest of these five numbers?
Question : What is the average of the first five multiples of 11?
Question : What is the average of the first 57 natural numbers?
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile