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The average is all the numbers added together and then divided by the # of numbers.

(80+85+90+88+86+83+89+70)/8

=671/8

=83.875

Order of operations has the brackets first and then the division.

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Q: What is the average of 80 plus 85 plus 90 plus 88 plus 86 plus 83 plus 89 plus 70?
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