What is the average of first 9 prime numbers?

Correct option is D

Given:
First 9 prime numbers are:
2, 3, 5, 7, 11, 13, 17, 19, 23 
Formula Used:
$$\text{Average} = \frac{\text{Sum of all observations}}{\text{Number of observations}}$$​​
Solution:
Sum of first 9 prime numbers = 2 + 3 + 5 + 7 + 11+ 13 + 17 + 19 + 23 = 100
Average = $$\frac{100}{9}$$​ = 11.11