Question

The average of two numbers is 6 and that of another three numbers is 8. The average of these five numbers is:
1. 6.5
2. 7.6
3. 7.2
4. 5.5

Answer 1

Correct Answer - Option 3 : 7.2

Given:

Average of two numbers is 6

Average of another three numbers is 8

Formula used:

Average = sum of observation/no. of observations

Calculation:

6 = sum of two numbers/2

⇒ sum of two numbers = 12

8 = sum of three numbers/3

⇒ sum of three numbers = 24

⇒ sum of all five numbers = 12 + 24 = 36

Average of five numbers = 36/5 = 7.2

∴ The average of these five numbers is 7.2