Identify each of the following data sets as either a population or a sample: a. The grade point averages (GPAs) of all students at a college. b. The GPAs of a randomly selected group of students on a college campus. c. The ages of the nine Supreme Court Justices of the United States on January 1, 1842. d. The gender of every second customer who enters a movie theater. e. The lengths of Atlantic croakers caught on a fishing trip to the beach.

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