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
Answer (1)
10th Jan, 2024
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.
Comments (0)
Related Questions
Know More about
Staff Selection Commission Multi Tasking ...
Answer Key | Cutoff | Selection Process | Preparation Tips | Eligibility | Application | Exam Pattern
Get Updates Brochure
Thank You!
Your Staff Selection Commission Multi Tasking Staff Exam brochure has been successfully mailed to your registered email id “”.
Upcoming Exams
Application Date:
23 Oct, 2024
- 25 Dec, 2024
Exam Date:
19 Dec, 2024
- 29 Dec, 2024
Application Date:
11 Dec, 2024
- 31 Dec, 2024
Application Date:
11 Dec, 2024
- 31 Dec, 2024
Tier II
Exam Date:
18 Jan, 2025
- 20 Jan, 2025
