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The average of 10 numbers is 12. If we subtract 3 from each number, what is the new average ?

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Kerala PSC Common Preliminary Exam (GRADUATE LEVEL) PYP - 096/21
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  1. 36
  2. 15
  3. 4
  4. 9

Answer (Detailed Solution Below)

Option 4 : 9
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Detailed Solution

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Given:

The average of 10 numbers = 12

Each number is decreased by 3

Formula used:

New average = Old average - Decrease per number

Calculation:

New average = 12 - 3

⇒ New average = 9

∴ The correct answer is option (4).

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