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The first three scores were 90 100 90 What should he score on the fourth test to keep his mean score at 90 or higher?
Wiki User
∙ 15y ago
(90+100+90+x)/4=90.
Wiki User
∙ 15y ago
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What score must she earn on the fourth test if a student wants an average or arithmetic mean of exactly 87 and she earned scores of 87 then 81 and 88 on the first 3 of 4 tests?
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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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