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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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15y ago

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What grade do I need on my final to get an A in the class?

You would need to know all your other grades for that class and you would need to know the grading scale for the final but probably the highest you would want is an A the lowest is a B.


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Missing information - you need the worth (weight) for every grade, not just for some of them. The way you calculate this so-called "weighted average" is to multiply each grade by its weight, and add everything up. Then you divide by the total "weight". Example: exam 1: grade is 80; weight is 40. exam 2: grade is 70; weight is 60. 80 x 40 + 70 x 60 = 3200 + 4200 = 7400. Divide this by the total weight (40 + 60 = 100), and you get a weighted average of 74.


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Related Questions

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