the mean of 16 items was found to be 30 on rechecking it was found that 2 items were wrongly taken as 22 and 18 instead of 32 and 28 find the correct mean
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the sumof 16 items=16*30
the correct two remaining items is =32+28.
summing all and dividing by number of items.
we get new mean=((16*30-18-22)+32+28)/16
=31.25
the correct two remaining items is =32+28.
summing all and dividing by number of items.
we get new mean=((16*30-18-22)+32+28)/16
=31.25
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