Which method requires finding out the income of every individual in a region to calculate the average income?

Census method

The correct answer is option 2: Census method

The Census method requires finding out the income of every individual in a region, adding them up, and dividing by the number of individuals to get the average income.

Here's why the other options are not ideal:

    A) Sample method: This method involves surveying a smaller representative group of the population, not everyone.
    C) Random sampling: This is a specific type of sampling where individuals are chosen randomly from the population. While it can be used within a census, it wouldn't involve surveying everyone.
    D) Non-random sampling: This method involves choosing a sample that is not representative of the entire population. It wouldn't be useful for calculating an accurate average income.