15. The quality-control manager of a Long John Silver's restaurant wants to analyze the length oftime that a car spends at the drive-thru window waiting for an order. It is determined that the mean time spent at the window is 59.3 seconds with a standard deviation of 13.1 seconds. The distribution of time at the window is skewed right. (a) [1] To obtain probabilities regarding a sample mean using the normal model, what size sample would be necessary? {circle the correct response) 115.05N 11210 n