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Multiple choice

The average of 8 numbers is 38.4. Out of these numbers, the average of 7 number is 39.2. The 8th number is-

  1. 28.8

  2. 32.8

  3. 34.8

  4. 36.8

  5. 40.8

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sum of 8 numbers = 8 × 38.4 = 307.2. Sum of 7 numbers = 7 × 39.2 = 274.4. The 8th number = 307.2 - 274.4 = 32.8. Use the relationship: Total = Average × Count.

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