Question: ***prioritize c*****\r\n\r\nSuppose you would like to estimate the average daily number of car crashes that occur at your hometown. With that in mind, you take a sample of 15 days where you record the “daily number of car crashes” (= “X”) at your hometown on each of those days. The data is displayed below.\r\n12, 7, 17, 11, 9, 8, 19, 22, 12, 17, 15, 9, 12, 21, 15\r\na) Please calculate the sample average.\r\nb) Please calculate the standard error of the sample average. (Please make sure to show your calculations.)\r\nc) Suppose that your friend tells you that the Miu_X is 13.5. If you were to believe your friend, then what is the 27th percentile of the X_bar?  Edit