MCQ
The average of first $50$ natural numbers is:
- A$12.25$
- B$21.15$
- C$25$
- ✓$25.5$
✓
Answer
Correct option: D.
$25.5$
The first $50$ natural numbers are $1, 2, 3, ..... ,50$
We know that, the sum of first nn natural numbers is $ = \frac{\text{n}({\text{n+1}})}{2}$
$\therefore$ sum of first $50$ natural numbers is $\frac{{50}{(51)}}{2} = {25}(51) = {1275}$
the average of first $50$ natural numbers is $\frac{1275}{50} = {25.5}$
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