Question

The mean of first 10 natural number is:

• A. 4.5
• B. 5.5
• C. 6.5
• D. 5

Answer 1

The correct option is B

5.5

First 10 natural numbers are 1 to 10.

Sum of first n natural number = $\frac{n(n+1)}{2}$

So, Sum of first 10 natural numbers is 55.

Mean= $\frac{55}{10}$ = 5.5