The mean of 40 observation was 160 . It was detected o recheking that the value of 165 was wrongly copied as 125 for computa
tion of mean . Find the corr mean
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mean=sum of all numbers / 40
sum of all numbers /40=160
=> sum of all numbers is 6400
but 165 is wrongly copied as 125
correct sum of numbers is 6400-125+165=6440
=>correct mean=6440/40=161
correct mean is 161
sum of all numbers /40=160
=> sum of all numbers is 6400
but 165 is wrongly copied as 125
correct sum of numbers is 6400-125+165=6440
=>correct mean=6440/40=161
correct mean is 161
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