The mean of 150 items was found to be 60 Later on it was discovered that the values of two items wer...

Question

The mean of 150 items was found to be 60 Later on it was discovered that the values of two items were misread are 52 and 8 instead of 152 and 88 respectively Find the correct mean

Accepted Answer

It is given that Mean of 150 items 60 So the total sum 150 60 9000 We know that Correct sum of items sum of 150 items sum of wrong items sum of right items By substituting the values Correct sum of items 90000 52 8 152 88 On further calculation Correct sum of items 9000 60 240 So we get Correct sum of items 9180 So the correct mean correct sum of items total number of items By substituting the values Correct mean 9180150 612 Therefore the correct mean is 612

RS Aggarwal Solutions Class 9 Mathematics Solutions for Mean Median And Mode Of Ungrouped Data Exercise 18A in Chapter 18 - Mean Median And Mode Of Ungrouped Data