The mean of 100 observations is 60. If one observation of 50 is replaced by 110, then what will be the new mean.
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Mean of 100 observation =50
∴Total of 100 observation=100×60=6000
If one of the observation 50 is replaced by 150 than total of new observation is=6000−60+110= 6,050
Hence the mean of new 100 observation=
6050÷ 100= 60.5
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