Double.NaN
if the designated subarray is empty. Throws IllegalArgumentException
if the array is null.
See {@link Mean} for details on the computing algorithm.
@param values the input array @param begin index of the first array element to include @param length the number of elements to include @return the mean of the values or Double.NaN if length = 0 @throws MathIllegalArgumentException if the array is null or the array indexparameters are not valid
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