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The average of 12 numbers is 9. If each number is multiplied by 2 and added to 3, the average of the new set of numbers is
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- 9
- 18
- 21
- 27
- 9
Correct Option: C
If each number of a set be multiplied by m, the average gets multiplied by m.
If each number of a set be increased by p, the average gets increased by p.
Here , The average of 12 numbers = 9
m = 2 , p = 3
∴ Required average = m × The average of 12 numbers + p = 2 × 9 + 3 = 21
