SOLUTION: Charlie has scores of 88, 95, and 89 on the first three tests. What score must he make on the fourth test so that the average of all four tests is exactly 93?
a.91.25 b.93 c
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-> SOLUTION: Charlie has scores of 88, 95, and 89 on the first three tests. What score must he make on the fourth test so that the average of all four tests is exactly 93?
a.91.25 b.93 c
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Question 326734: Charlie has scores of 88, 95, and 89 on the first three tests. What score must he make on the fourth test so that the average of all four tests is exactly 93?
a.91.25 b.93 c.95 1/3 d.97 e.100
You can put this solution on YOUR website! Let Charlie scores N in the fourth test to get an average of 93 marks.
Hence, (88 + 95 + 89 + N)/4 = 93
=> 272 + N = 4 x 93 = 372
=> N = 372 - 272 = 100
Hence, Charlie must score 100 in the fourth test to get an average of 93 marks in all four tests.
You can put this solution on YOUR website! charlie's first 3 scores = 88,89,95
Total of these scores = 272
..
He needs an average of 93 in 4 tests
so total of 4 tests will be 93 *4=372
..
The difference of the totals will give the score for the 4th. test to achieve 93 average
372-272=100
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