30. A stringing machine is a device for adjusting the tension of strings in a tennis racket. Some tennis players ask for a string tension of 65 pounds. The actual tension pro- duced by the machine for the rackets belonging to these players varies according to a normal distribution with mean 65 pounds and standard deviation 2 pounds. Use this information to answer this question and the 2 following questions. For all rackets (belonging to players asking for a string tension of 65 pounds), there is a value x such that 20% of rackets will have an actual string tension less than x pounds. What is x? A. 60.9 B. 69.1 C. 66.7 D. 63.3 E. 65