The mean of 50 items was 30 . Later it was discovered that 2 items were misread as 16 and 80 instead of 60 and 18 . Find the correct mean
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Step-by-step explanation:
According to the question
The mean of 50 no. is = 30
Sum of 50 no. is = 50×30=1500
later it was discovered that two entries were wrongly entered as 82 and 13 instead of 28 and 31.
∴ Difference = (82 + 13) - (28 + 31) = 95 - 59 = 36 (Extra)
∴ Actual sum of 50 numbers is 1500 - 36 = 1464
∴ Actual avg. 146450=29.28
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