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 (*) 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 A. Observe an employee's work Number of nonproductive hours in all eight - hour workday E . Weigh a shipment of goods Number of pounds