801 A political scientist wants to know how college students

(8.01) A political scientist wants to know how college students feel about the Social Security system. She obtains a list of the 3032 undergraduates at her college and mails a questionnaire to 260 students selected at random. Only 107 questionnaires are returned.

What is the size of the sample?

Only 107 questionnaires are returned, so the sample size is 107.