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in Statistics by (49.3k points)
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The mean of 20 observations is 50. If the observation 50 is replaced by 140, what will be the resulting mean or new mean?

1 Answer

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Best answer

Number of observations = 20

Mean of these observations = 50

i.e. \(\overline x\) = 50

Sum of the observations = 20 x 50 = 1000
50 is replaced by 140.

New sum of the observations = 1000 – 50 + 140 = 1090

New mean = 1090/20 = 54.5.

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