Question
In the Board exams, the average marks scored by 20
students is 55. But while calculating, marks of 2 students were wrongly entered as 43 and 60 in place of 54 and 45. Then, what will be the correct average marks of the 20 students.Solution
ATQ, Total marks which are (incorrect) in Board exam are  = 55 × 20 = 1100 Now, the correct total marks will be = 1100 + (54 + 45) – (43 + 60) = 1096 Correct average marks = (1096/20) = = 54.8
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