Question

the mean of 5 observations was calculated as 145 , but it was later on deducted that one observations was misread as 45 in place of 25 .find the correct mean of the observations

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Answer 1

total of the observation
= 145 x 5
= 725

correct total
= 725 -45+25
= 750 - 45
= 705

mean = 705/ 5 = 141

Answer 2

Mean = Sum of observations/Total number of observations

145 = Sum/5
Sum = 145 x 5 = 725

Now correct sum = 725 - 45 + 25
= 705

Correct mean = 705/5 = 141

Hope This Helps You!