(b) The mean of 100 observations is 50. If one of the observation which was 50 is replaced
by 150 then what will be the resulting mean?
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Mean of 100 observation =50
∴Total of 100 observation=100×50=5000
If one of the observation 50 is replaced by 150 than total of new observation is=5000−50+150=5100
Hence the mean of new 100 observation=
100
5100
=51
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