Multiple choice

Average of 6 numbers is 24. If 3 is subtracted from each number, what will be the decrease in its average?

  1. 2

  2. 3

  3. 4

  4. 5

  5. 6
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B Correct answer
Explanation

If every number in a set is decreased by a constant k, the average of the set also decreases by k. Here, k=3.

AI explanation

When a constant number is subtracted from each value in a set, the average of the set decreases by that exact same constant. Therefore, if 3 is subtracted from each of the 6 numbers, the overall average decreases by 3.

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