Mark runs a home improvement business. He is happy with the level of business he receives, but he wants to learn more about his customers, so he studies information compiled by the U. S. census bureau and other government agencies, databases created by marketing research firms, and sales and other internal reports. What kind of data is Mark using in this scenario

Secondary Data

Explanation:

Secondary data is defined as the data that is collected by the other people other than the end users of it.

In the case, Mark is the end users. And the data is of U. S census bureau, other governments agencies, database, however, is not collected by Mark but by marketing research firms and different reports instead.

So that, in this case, Mark is using secondary data.