Arithmetic mean of nice observations is calculated as 38. But in doing so, mistakenly the observation 27 is taken insted of 72. Find the actual mean of data.
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Answer:
mean-sum of observations/ total
observations
38=sum/9
38x9=sum
342=sum
If a number is mistakenly written as 72 then 45 should be added to the sum
sum=342
actual sum should be:
342+45
=387
mean-sum/total observations
=387/9
= 43
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