Finding averages

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Give the arithmetic mean of the following six scores:

83, 87, 99, 90, 82, 84

Round your answer to the nearest whole number.

To find the mean of a group of numbers, add the numbers first:

Divide the sum by the number of scores; this is 6, so

$525 \div 6 = 87 \textup{ R }3$

or $87\frac{3}{6} = 87\frac{1}{2}$

This rounds up to 88.