Question
In a 100-marks test, the average of marks scored by 50
students was found to be 65. Later on, it was discovered that a score of 88 was misread as 68. Find the correct average.Solution
ATQ,
Given: Average (incorrect) = 65 Students = 50 Total (incorrect) = 65 × 50 = 3250 Misread: 88 was recorded as 68 ⇒ Difference = 20 Correct total = 3250 + 20 = 3270 Correct average = 3270 ÷ 50 = 65.4
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