Find the arithmetic mean of the following data.

12 , 13 , 18 , 12 , 15 , 15 , 16 , 13 , 19 , 17

Correct option is D

Given:

Data set: 12,13,18,12,15,15,16,13,19,17

Formula Used:

$$\text{Arithmetic Mean} = \frac{\text{Sum of all observations}}{\text{Total number of observations}}$$  

Solution:

Sum of all observations = 12+13+18+12+15+15+16+13+19+17=150

Total number of observations = 10

​$$\text{Arithmetic Mean} = \frac{150}{10} = 15$$​​​​​​​​