SOLUTION: To earn a A in a class a student needs to have at least an average of 90 on 5 equally weighted tests A student gets grades of 95 ,86,98, and 77 on the first 4 tests.What grades can

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Question 1140301: To earn a A in a class a student needs to have at least an average of 90 on 5 equally weighted tests A student gets grades of 95 ,86,98, and 77 on the first 4 tests.What grades can the student get on the fifth test and still earn an A

Answer by Theo(13342) About Me  (Show Source):
You can put this solution on YOUR website!
there are 5 equally weighted test.
for the student to get an average of 90, the total has to be equal to 5 * 90 = 450.

that's because a total score of 450 / 9 equals an equally weighed average of 90.

the 4 scores that the student has so far adds up to 356.

subtract that from 450 to get 450 - 356 = 94.

that's the score the student needs to get on the fifth test.

if the student gets a score of 94 on the last test, then the sum of all 5 scores will be 356 + 94 = 450 and the average will be 450 / 5 = 90.