A student has earned the following scores on four 100-point tests this marking period: 63, 72, 88, and 91. What score must the student earn on the ﬁfth and ﬁnal 100-point test of the marking period to earn an averagetest grade of 80 for the ﬁve tests?

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13-05-2014
Mathematics

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A student has earned the following scores on four 100-point tests this marking period: 63, 72, 88, and 91. What score must the student earn on the ﬁfth and ﬁnal 100-point test of the marking period to earn an averagetest grade of 80 for the ﬁve tests?

Sagot :

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Mackiemesseridn Mackiemesseridn · Answer 1 · 2014-05-13T05:44:35-04:00

Mackiemesseridn Mackiemesseridn

13-05-2014

In order to have average 80 score from 5 tests, student needs to have 400 points (80%*500=0.8*500=400)
So far he has 63+72+88+91= 314
400-314=86

He needs to get 86 points from the last test.
Since he is obviously getting better at tests, i think he'll manage :)

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