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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. |
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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 = 9180/150 = 61.2 Therefore, the correct mean is 61.2. |
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