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The mean of five numbers is 5. If one of the numbers is removed from the group, the mean of the remaining four numbers is 4.25. What number was removed from the group?

 Apr 25, 2023
 #1
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The number that was removed is 4*5 - 4*5.25 = 3.

 Apr 25, 2023
 #2
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[5 * 5]  -  [4 * 4.25] = 25 - 17 = 8 - was removed

Guest Apr 25, 2023

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