Which of these variables is a discrete random variable? a. the height of 12 randomly selected people in a store b. the time it takes for student in a class to complete a quiz c. the number of people wearing glasses in a classroom d. none of the above 2. The librarian surveys every 7th student from an alphabetized list to determine reading preferences for new purchases. What tipe of sampling method is used in this scenario a. systematic random sampling b. stratified random sampling c. simple random sampling d. cluster random sampling

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