If we multiply the mean of the data set with the number of observations, we get the of all observations.
We have a set of observations : 20, 34 , 42 , 56 , 64 , 29 , 41 , 30 and 35 By how much does the mean change if we include another value, 109 to this set of data.
If the number of observations in a data set is 25 and the mean of the data is 32. Then, the sum of all observations is ____________