Before shipping lawn mowers to dealers, an inspector attempts to start each mower and notes any that do not start on the first try. The lot size is 21 mowers, and average of 5 per lot did not start. The inspector wants to set up a control chart using 3 standard deviation control limits. What is the upper control limit? Only put in the number and keep two decimal places, not the percentage. For example, use "0.67" instead of 67%.