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OpenStudy (anonymous):
The average age of 5 children is 9. If four of the ages are 4,7,13 and 15, what is the age of the fifth child?
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OpenStudy (anonymous):
5 average is 9 the formula for mean is Mean = (sum of results)/(number of results)
OpenStudy (anonymous):
(4 + 7 + 13 + 15 + x)/5 = mean so solve for x
OpenStudy (anonymous):
I'm not going to do it for you
OpenStudy (anonymous):
But I'm willing to help you solve it whereever you have problems.
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