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Part ACSIR NET December 2024removing-a-number-that-raises-the-average

Removing a number that raises the average

The average of seven numbers is 71. If we exclude one of these numbers, the average becomes 75. What is that number?

  1. A.75
  2. B.74
  3. C.73
  4. D.47✓ Correct

You have the answer. Trap Analysis is why the other three were written.

Not a worked solution repeated four times — the specific reasoning error each wrong option was built to reward, and why this one tests execution slip.

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50 are analysed free — try those first.

The trap it tests

Execution slip

The idea was right. The computation was not.

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