___4. The Barangay captain wants to know how is his constituents' income differ from the average income of each family, What should he do?

A. Get the standard deviation of all the family's income.
B. Get the standard deviation of the richest and the poorest family's income. C. Get the range of the richest and poorest family's income in the barangay. D. Get the range of the richest family's income to the fund of the barangay for each family.​