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Question
The mean of five numbers is 27. If one number is excluded, their mean is 25. Find the
excluded number.
Solution
The mean of the numbers 27
The, sum of five numbers = 5 × 27
= 135.
If one number is excluded, then the new mean is 25
∴ Sum of numbers 4× 25 =100
∴Excluded number 135 -100
=35
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