A state department of tourism and recreation collects data on the number of cars

A state department of tourism and recreation collects data on the number of cars with out-of-state license plates in a state park. (The groups position is that more out-of-state plates means the states advertising programs are working.) The sample size is fixed at n=90 each day. Data from the previous 20 days indicate the following number of out-of-state license plates: Day Out-of-state Plates1 242 333 184 215 266 317 158 189 2310 1311 2212 1513 2514 3315 1616 2217 3418 1019 2320 13a. Calculate the overall proportion of tourists (cars with out-of-state plates).b. Calculate the LCL and UCL for these data.c. Plot the control chart. Are all points within the control limits?d. What action do you suggest for improving this process?