Given are the ages (in years) of five people: 20, 30, 35, 40 and 45. Calculate the average age in years.

Correct option is A

Given:

Ages (years) = 20, 30, 35, 40, 45

Formula Used:
Average $$=\dfrac{\text{Sum of observations}}{\text{Number of observations}}$$​​

Solution:
Sum = 20 + 30 + 35 + 40 + 45 = 170
Number of people = 5
Average =$$\dfrac{170}{5}$$​= 34 years