30-08-2015
Mathematics

Answered

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.

Verified Answer :

konrad509 konrad509

30-08-2015

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

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