Correct Answer - Option 2 : 25
Given:
Average of 5 numbers in a group is 23
Average of the first two numbers is 24
Average of the last two numbers is 21.
Concept used:
Average × number + average × number + ….. = average of all × total number
Calculation:
Let the value of the middle number be ‘x’
24 × 2 + x + 21 × 2= 23 × 5
⇒ 90 + x = 115
⇒ x = 25
∴ Middle number = 25