A student on her first 3 tests receives on an average score of N points. If she exceeds her previous average score by 20 points on her fourth test, then what is the average score for the first 4 tests?
N + 5
The average score of student in 3 tests is N points. Hence the total score = 3N points. Given the score in fourth test = N + 20, the average score of student in four tests will be = (3N +N+20)/4 = N+5
Important Questions from Average
Average of 40 numbers is 71, if the number 100 replaced by 140, then average is increased by
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2. The average score of Class-A will definitely increase.
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