Correct Answer - Option 1 : 23
Given:
Average of 5 numbers in a group is 30
Average of the first two numbers is 35
Middle number is 34
Concept used:
Sum of all observations = Average × Total number of observations
Calculation:
Let the average of last two numbers be ‘x’
35 × 2 + 34 + x × 2= 30 × 5
⇒ 70 + 34 + 2x = 150
⇒ 2x = 46
⇒ x = 23
∴ Average of last two numbers is 23