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Re: Dave’s quiz scores are 60, 90, and 80. What is the score Dave would ne [#permalink]
Dave’s quiz scores are 60, 90, and 80.
Now we can calculate the next score without using the average equation formulae :

If we say that average is 82 then , next score must add that much weightage to make it 82.
Consider a line segment

<--------------------------------------avg--------------------------------------->
60 80 82 90 x
we must add 60+ 22 = 82 (avg) --- 22 (1)
we must add 80 + 2 = 82 (avg) --- 2 (2)
we must dec 90 - 8 = 82 (avg) --- -8 (3)

so total 22+2- 8 = 16 we need to add to 82 ..add because here the sign is positive
so, 82(avg) + 16 = 98

Ans D
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Re: Dave’s quiz scores are 60, 90, and 80. What is the score Dave would ne [#permalink]
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