Select 10 students currently enrolled at your college and collect data for these three variables: X: number

Question:

Select 10 students currently enrolled at your college and collect data for these three variables: X: number of courses enrolled in Y: total cost of textbooks and supplies for courses Z: method of payment used for textbooks and supplies
a. What is the population?
b. Is the population finite or infinite?
c. What is the sample?
d. Classify the three variables as nominal, ordinal, discrete, or continuous.