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Five numbers has a mean of 12. When one (1) number is removed the mean is 11. What is the value of the number removed?

User Yadu
by
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1 Answer

3 votes

Answer:

16

Explanation:

The mean of a group of values is calculated as

mean =
(sum)/(count)

Given 5 numbers with a mean of 12, then


(sum)/(5) = 12 ( multiply both sides by 5 )

sum = 60

let the number removed be x , then


(60-x)/(4) = 11 ( multiply both sides by 4 )

60 - x = 44 ( subtract 60 from both sides )

- x = - 16 ( multiply both sides by - 1 )

x = 16

The number removed was 16

User Lebolo
by
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