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Average of 5 numbers is 66.4. The average of first 2 numbers is 67 and average of last 2 numbers is 75. Find the middle number. 
1. 48
2. 75
3. 40
4. 62
5. 50

1 Answer

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Best answer
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

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