please show work

QUESTION 17 Information for Problems 17.20. New York City Yellow Taxi Company has 20 taxi cars that operate 24 hours per day. A tad car requires service repar every20 days, on average according to an exponential distribution. The service is done at the company's own garage which has a repairperson on duty at all times. The average time required to service a taxi car is 16 hours (exponentially distributed). I have computed the probability of no car being serviced at the garage to be 0.380085 Which queueing system model is appropriate for this problem? MM/ queue MM/S queue OM/M1/C finite capacity finite queue) M/M1IFP (finite population queue QUESTION 18 On average, how many taxi cars are not available for use at any one time? O 1.135 cars 0.817 cars 1.402 cars 1.262 cars QUESTION 19 What is the average time a taxi car is not available for use? 1.423 days 1.508 days 1.152 days 1.346 days QUESTION 20 At any one time, how many taxi cars are available for the police department to use? O 18.598 cars 19.738 cars 18.865 cars 19.183 cars