A table is an array of numbers in rows and columns. Here both the table and the columns have headers. Columns $1$ and $2$ contain absolute numbers. Column $3$ contains relative numbers, namely the ratio of the number of men and women. Using the table you can compute how many men and women lived in D in a certain year.

There are two types of tables:

• tables with research data, like this one;

• tables containing condensed data such as prices, times and work methods, such as the prices of TPG-post, departure times of the Dutch Railroads and computation tables for insurance premiums.

Although tables are meant to clarify things and you should be able to interprete them properly, this often creates questions...