if the mean of a set of observation
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x1+x2..........x10 mean is 20
x1+4........x10+40/10
=>240/10=>24
mean=24
mean=sum of observations/total number of observations
mean=x1+4+x2+8.......+x10+40/10
x1+4........x10+40/10
=>240/10=>24
mean=24
mean=sum of observations/total number of observations
mean=x1+4+x2+8.......+x10+40/10
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