The mean of a particular set of 7 numbers is 4. Six of the numbers in the set are known: 1,2,2,5,7,and 8. Identify the missing number.

asked May 11, 2016 107k views

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The mean of a particular set of 7 numbers is 4. Six of the numbers in the set are known: 1,2,2,5,7,and 8.

Identify the missing number.

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$(1+2+2+5+7+8+x)/(7)=4\\ (25+x)/(7)=4\\ 25+x=28\\ \boxed{x=3}$

Penu answered May 15, 2016

by Penu

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