It is represented by the total number of people divided by total land area. This would be important because we can calculate how many people live in an area.
It is represented by total number of people divided by the total amount of arable land. This would be important to know because we are able to determine if a country could be supported by its crops for food.
It is represented by total number of farmers to arable land. This would be important because it helps find out economic differences between countries. For example, a more developed country has a lower one because they have more technology and don't need as many farmers.