1. The mean of 16 items was found to be 30. On rechecking, it was found that two items were wrongly taken as 22 and 18 instead of 32 and 28 respectively. Find the correct mean
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Answer:
Mean=sum of obs÷No of obs
30=sum of obs ÷16
Sum of obs =30×16
=480
New sum =480+(32+28)-(22+18)
=480+60-40
=540-40
=500
New mean=New sum÷16
=500÷16
=31.25 Answer
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