Question
The average score of 20 students in a test is 65. Later
it is found that the score of one student was wrongly taken as 54 instead of 84. What will be the correct average?Solution
Wrong total = 20 × 65 = 1300 Correct total = 1300 − 54 + 84 = 1300 + 30 = 1330 Correct average = 1330 / 20 = 66.5 Hence, Correct average = 66.5.
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