The midpoint, or number that divides a series of values into two groups of equal numbers of values and is often used when there can be extreme values like with national household incomes, is referred to as the .

The midpoint, or number that divides a series of value into two group of equal numbers of value is refered to as "MEDIAN".

It can also be used when they is extreme values like the national incomes.

Explanation: The median is a value at the midpoint of a frequency distribution, it is used to denote the center of a line of numbers, it also tells the higher part and the lower part of the numbers. In statistics, median tells the probability of an event to occurs is equal. When median is equal to mean, it means that the frequency of numbers are properly arranged from the lowest order to the highest order.

National household income values are values with frequency of numbers, median can be used to know the midpoint of the numbers and to determine to lower part and the higher part.

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