Windshield Replacement Company (WRC)is a car windshield manufacturer that uses 25% recycled glass in the production of new windsheilds. WRC currently purchases its recycled glass from a recycling depot but has the opportunity to receive recycled glass at no cost from its local municipality. However, the glass from the local municipality has not been sorted as well as that from the recycling depot, so there is a higher chance of contaminants. The more the contaminants, the lower the glass quality and the lower the price that WRC can charge its customers. Management of WRC has determined a range of possible revenue per windshield, based on the percentage of contaminants. Which of the following is the best tool to present the uncertainty in revenue, so that management can determine if it should switch recycled glass suppliers? Question 9 options: Expected value Event uncertainty Discrete probability distribution Error bar on a graph