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Question -

The mean of 5 numbers is 18. If one number is excluded, their mean is 16. Find the excluded number.



Answer -

Mean of 5 numbers = 18
Total = 18 x 5 = 90
By excluding one number, the mean of remaining 5 – 1=4 numbers = 16
Total = 16 x 4 = 64
Excluded number = 90 – 64 = 26

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