1. to monitor campus security, the campus police office is taking a survey of the number of students in a parking lot each 30 minutes of a 24-hour period with the goal of determining when patrols of the lot would serve the most students. if x is the number of students in the lot each period of time, then x is an example of
a. a categorical variable
b. a statistic
c. a continuous variable
d. a discrete variable