Listed is a series of experiments and associated random variables . In each case , identify the values that the random variable can assume and state whether the random variable is discrete or continuous . Experiment Random Variable ( x) a . Take a 20 - question Examination Number of questions answered correctly b . Observe cars arriving at a tollbooth for ONE hour Number of cars arriving at tollbooth C. Audit 50 tax returns Number of returns containing Errors J. Observe an employee's work Number of nonproductive hours in all eight - hour workday { . Weigh a shipment of goods Number of pounds