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Sticky Note
If the average of five numbers is 10 and one number 20 is removed, what is the new average?
  1. 8.0
  2. 7.5
  3. 6.0
  4. 10.0
Explanation

We are given:

  • Average of 5 numbers = 10

  • So, total sum of the 5 numbers = 10 × 5 = 50

Now, one number (20) is removed:

  • New sum = 50 − 20 = 30

  • New number of values = 5 − 1 = 4

So, new average = 30 ÷ 4 = 7.5

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