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Question
The average marks of 55 students in a class were calculated
as 72. However, there were errors in recording the marks of four students. The incorrect marks recorded were 84, 74, 70, and 88, but the actual marks of these students were 56, 32, 48, and 70, respectively. Find the correct average marks of the class.Solution
Total marks obtained by students = 72 × 55 = 3960
Total misread marks = (84 + 74 + 70 + 88) – (56 + 32 + 48 + 70) = 110
Desired Average = (3960 – 110)/55 = 70
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