Problem Statement 
 On January 1, 2007, a confectioner made several candies.
On the last day of each month she allows her children to eat several of those candies.
The lifetime of a candy is the number of days between January 1 and the day the candy is eaten, inclusive. For example, the lifetime of a candy eaten on January 31 is 31, and the lifetime of a candy eaten on December 31 is 365 (note that 2007 wasn't a leap year).
You are given a int[] eatenCandies, the ith element of which is the number of candies eaten on the last day of the ith month of 2007 (January is month 0, February is month 1, etc.). Return the average lifetime of the candies. 

Definition 
 Class:  AverageCandyLifetime  Method:  getAverage  Parameters:  int[]  Returns:  double  Method signature:  double getAverage(int[] eatenCandies)  (be sure your method is public) 




Notes 
  The year 2007 was not a leap year. 
  The number of days in the months of 2007, in order, were 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30 and 31. 
  The returned value must be accurate to within a relative or absolute value of 1E9. 

Constraints 
  eatenCandies will contain exactly 12 elements. 
  Each element of eatenCandies will be between 0 and 1000, inclusive. 
  The sum of all the elements in eatenCandies will be greater than 0. 

Examples 
0)  
 {1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0} 
 Returns: 60.5  One candy was eaten on January 31 and the other was eaten on March 31.
The lifetimes of the candies are 31 and 31+28+31=90. The average lifetime is (31+90)/2=60.5. 


1)  
 {0, 1000, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} 
 Returns: 59.0  All candies were eaten on February 28. The lifetime of each candy is 31+28=59, so the average candy lifetime is 59.0. 


2)  
 {0, 0, 0, 0, 0, 1, 0, 0, 0, 50, 0, 0} 
 Returns: 301.5882352941176  Most of the candies were eaten on October 31 (Halloween), and the lifetime of each of those candies is 304. The average lifetime is smaller than 304, because of a candy with lifetime 181, eaten on June 30. 


3)  
 {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12} 
 Returns: 252.80769230769232  
