Statistics
 Mean of data sets
Mean or average of a data is given by the formula,
Mean =
Note:

 Mean always lies between the highest and lowest observations of the data.
 It is not necessary that mean is any one of the observations of the data.
1. If the mean of n observations ${x}_{1},{x}_{2},{x}_{3}....{x}_{n}$ is $\overline{x}$ then $\left({x}_{1}\overline{x}\right)+\left({x}_{2}\overline{x}\right)+\left({x}_{3}\overline{x}\right)+...+\left({x}_{n}\overline{x}\right)=0$.
2. If the mean of n observations ${x}_{1},{\mathrm{x\dots}}_{}$
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