the average marks of 72 students is shown as 69. it includes a wrong entry of 45 marks instead of 54 marks. the correct average is?
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total marks=72*69=4968
marks after reducing 45 and then 54 to it=4977
correct avg=4977/72
69.1 is the ans
marks after reducing 45 and then 54 to it=4977
correct avg=4977/72
69.1 is the ans
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