A set of data is135791113.

Then the median of this set of data is 7, and then the calculated average is 7.

The formula of variance is 1/n((x-x 1))? +(x-x2)？ +......+(x-xn)？ )

It means: subtract the average from each item, then square it, and then add it all up and divide it by the number of data.

Above n is the number of data, x is the average, and x is the average.