Question
Rahul’s average in 7 papers was noted as 68. Later, it
was discovered that his marks in Economics and Chemistry were wrongly recorded as 74 and 52 instead of 84 and 66. What is his actual average score?Solution
ATQ,
Total marks as per wrong data = 68 × 7 = 476
Correct total marks = 476 - (74 + 52) + (84 + 66) = 500
Actual average = 500 ÷ 7 = 71.43
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