The average mark of 12 students is 40. In the mean time it was detected that marks obtained by one of the students is considered 42 instead of 54 and other ones taken 74 instead of 50. Find the correct average.
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The average mark of 12 students is 40. In the mean time it was detected that marks obtained by one of the students is considered 42 instead of 54 and other ones taken 74 instead of 50. Find the correct average.
The mean mark is given by: Total marks/Total students
By how much does the total mark change from the given information?
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