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19-11-2017
Mathematics

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please help me understand this, i've been stuck on this question

please help me understand this ive been stuck on this question class=

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tynollette tynollette

19-11-2017

A is correct.
to find the average, you add up all three test scores, divide the sum by 3
85≤(83+91+n)/3≤90

multiply 3 to eliminate the fraction: 255≤(174+n)≤270
subtract 174: 81≤n≤96

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