the mean of 20 observations is 50 . if the observation 50 is replaced by 140, what will be the new mean of the observation
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Mean =(x1+x2------x20)/20
50=(x1+x2----x20)/20
1000=x1+x2-----x20
If 50 is replaced by 140, then sum of observations is =1000-50+140=1090
Mean =1090/20
Mean =54.5
50=(x1+x2----x20)/20
1000=x1+x2-----x20
If 50 is replaced by 140, then sum of observations is =1000-50+140=1090
Mean =1090/20
Mean =54.5
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