Correct Answer - Option 1 : 48
Given:
Average of 5 number = 66.4
Average of the first 2 numbers = 67
Average of last 2 numbers = 75
Formula used:
Average = Sum of numbers/Number of units
Calculation:
Sum of all 5 numbers = 66.4 × 5 = 332
Sum of first 2 numbers = 2 × 67 = 134
Sum of last 2 numbers = 2 × 75 = 150
Middle number = 332 – (134 + 150)
⇒ 332 – 284
⇒ 48
∴ The middle number is 48