The mean of 100 observations is 50. If one of the observations, 50 is replaced by 150, what is the resulting mean?
A
50.5
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B
51
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C
51.5
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D
52
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Solution
The correct option is B 51 Mean of 100 observations = 50 Sum of the 100 observations =S=(50×100)=5000 Replacing one observation value from 50 to 150, the total sum changes to, S = (5000 - 50 +150) = 5100 So the new mean = (new sum of observationstotal no. of observations) =(5100100) = 51