Question

the mean of 40 observations is 160. it is found that the value of 165 is wrongly copied as 125. Find the correct mean
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Answer 1

Step-by-step explanation:

mean of the 40 observation = 160.

Sum = 160x40 = 6400

correction= 165-125= 40

= 6400 + 40 = 6440

New mean=6440/40 = 161