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Arithmetic mean means that you need to add all the numbersand divide the sum by the number of numbers listed in the problem.

Therefore you add 8+12+15+21+11+x= 67 + x

Now you multiply 6 times 17, (because there are 6 numbers in the problem which are 8,12,15,21, and 11)

17x6=102

Now: 67+x=102

Solve for x

67+x=102

-67 -67

---------------

x= 35

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βˆ™ 14y ago
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Q: If the average arithmetic mean of 8 12 15 21 x and 11 is 17 then what is x?
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