Next Page Page 2 of 5 Question 2 (6 points) [6 marks] A hospital is worried that wait times in its emergency room are becoming too long and service failures are becoming more frequent. The hospital considers a wait time greater than 240 minutes (4 hours) to be a service failure. To investigate this problem, the hospital records the wait times for a random sample of 200 patients. The wait time has averaged 90 minutes; the standard deviation of the wait time is 18 minutes. Assume that wait time is a symmetric mound-shaped or bell- shaped distribution. a) [2 marks] What percentage of response times is greater than 126 minutes? b) [2 marks] What is the z-score for a response time of 240 minutes? Interpret this z- score. c) [2 marks] Are service failures at this hospital a frequent occurrence? Justify your