The MIDRANGE Function
The MIDRANGE (middle range) function returns a numeric value that is the
arithmetic mean (average) of the values of the minimum argument and the maximum
argument. The type of this function is numeric.
General Format

Arguments
- Argument-1 must be class numeric.
Returned Values
- The returned value is the arithmetic mean of the greatest argument-1 value
and the least argument-1 value.
- The comparisons used to determine the greatest and least values are made
according to the rules for relation conditions. See the topic Relation Condition
in the chapter Procedure Division.
- Floating-point format is used for numeric non-integer results.