Question

the mean of 5 numbers is 20 if one is number is excluded mean of remaining number become 23 find the excluded number

Answer 1

Please refer the above photograph for the used process
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Answer 2

ANSWER...................,

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