An Internet service provider conducts a study to better understand their customers. Based on data collected they estimated that the number of computers in use at each customer's residence could be estimated by the following probability distribution. # Computers 1 2 3 4 5 6 7 8 Prob 60.0% 15.0% 10.0% 5.0% 4.0% 3.0% 2.0% 1.0% 100.0% Based on this distribution, what proportion of customers own 4 or more computers? (Enter your percentage as a decimal, i.e. 50% = .5)