Question
The average marks of Priya in 8 subjects was mentioned as
59. Her marks in English and Biology were wrongly recorded as 61 and 48, whereas they should have been 70 and 65. What is her actual average?Solution
ATQ,
Total based on incorrect entry = 59 × 8 = 472
Correct sum = 472 - (61 + 48) + (70 + 65) = 498
Actual average = 498 ÷ 8 = 62.25
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