The mean of 5 numbers is 20. If one number is excluded mean of the remaining numbers becomes 23. Find the excluded number.
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The mean of 5 number = 20
The sum of 5 number = 5 × 20 = 100
If one number is excluded ,
Then mean of 4 number = 23
Sum of 4 number = 4 × 23 = 92
∴excluded number = 100 - 92 = 8
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