l)The cdf which is not valid is . cdfa Cdf b* Cdf d The cdf values decrease near the value of 3:22. According to the graph, the probability of completing the service in under 2 hours would be lower than the probability of completing the service in under 1.9 hours. 2)If the correct model is cdf c, the probability of a service time less Than 2 hours is near0* 0.2 0.5