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 $x_1,{\mathrm{x\dots }}_{}$