Problem Statement  
A speed radar is installed in a highway zone where the maximum speed limit is maxLimit mph, and the minimum speed limit is minLimit mph. Any reading that is strictly above or below this interval is an infringement. Periodically, the radar readings are analyzed to make sure that the sensors are working properly. It is assumed that most drivers obey speed limits, and therefore, the radar will be considered faulty if more than 10% of its readings are infringements. Given the radar readings over a period of time, return the average speed of all cars that are driving within the speed limits. If the radar is faulty, return 0.0.  
Definition  
 
Notes  
  The returned value must be accurate to within a relative or absolute value of 1E9.  
Constraints  
  maxLimit will be between 1 and 200, inclusive.  
  minLimit will be between 1 and maxLimit, inclusive.  
  readings will contain between 1 and 50 elements, inclusive.  
  Each element of readings will be between 1 and 200, inclusive.  
Examples  
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