Question

The mean of first 10 whole numbers is:

• A. 4.5
• B. 5.5
• C. 6.5
• D. 4.5

Answer 1

The correct option is D

4.5

The first 10 whole numbers are 0 to 9.

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

So, Sum of first 9 natural numbers = $\frac{9\left(10\right)}{2}$ = $45$

Total number of observation = $10$

Mean= $\frac{45}{10}$ = $4.5$