The Mid-Range
Midrange the sum of the lowest and highest values in the data set, divided by 2. The symbol MR is used for the midrange.
That is, when we denote \(b\) as the smallest value of the data set and \(B\) as the largest value of the data set we calculate the midrange as:
\[\text{MR}=\frac{b+B}{2}\]