Question

the mean of 100 observations is 50 if one of the observations which was 50 is replaced by 40 the resulting mean will be

Answer 1

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Here is your answer

Mean of 100 observations = 50
Sum of 100 observations = 100 × 50 = 5000

If 50 is replaced by 40

Therefore, New sum of Observations = 5000 - 40 + 50

= 5000 + 10
= 5010

New Mean = $\frac {5010}{100}$

= 50.1

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