public static long[][] findTwoGroups(long[] values) {
    return findTwoGroupsRecursive(values, average(values), 2);
  }
The percentile method returns the least value from the given list which has at least given percentile.
@param values The list of values to find the percentile from
@param percentile The percentile
@return The least value from the list with at least the given percentile
app/com/linkedin/drelephant/math/Statistics.java