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An average is worked out by dividing the total of the scores by the number of scores.

You have 4 scores already so when you have done the next test it will be 5 scores. If you multiply 5 scores by 90 it gives you a total score of 450.

The 4 scores you already have adds up to a total of 354. If you subtract 354 from the 450 you get 96 and that is your target for the final test.

The average for the first 4 tests comes out at 88.5

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โˆ™ 2010-01-04 23:03:40
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Q: What if your test grades are 83 94 86 and 91 what grade fo you need to earn on your next test to have an average of 90?
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