Question

the mean of 7 numbers is 42 if one of numbers is excluded the mean reduces by to the excluded number is​

Answer 1

Mean of 7 numbers = 42

Then, the sum of 7 numbers = 7×42

= 294

Let the number excluded = x

then the sum of 6 numbers = 294 - x

Mean of 6 numbers = 39

294 - x ÷ 6 = 39

294 - x = 39 ×6

294 - x = 234

x = 294 - 234

x = 60

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