The mean of 20 observations of marks is found to be 40 later on it was discovered that one of the marks,53 was misread as83 find the correct average of the marks
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mean of 20 observations =40
total marks =40*20=800
but this is wrong total
correct total marks =800-83+53=770
correct mean marks =770/20=38.5 marks
total marks =40*20=800
but this is wrong total
correct total marks =800-83+53=770
correct mean marks =770/20=38.5 marks
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