final static class CStats
{
  static float mean( int[] series )
  {
    int total = 0;
    for ( int i=0;i<series.length;i++ )
    {
      total += series[i];
    }
    return (float)total / (float)series.length;
  }
  
  static float mean( float[] series )
  {
    float total = 0;
    for ( int i=0;i<series.length;i++ )
    {
      total += series[i];
    }
    return total / (float)series.length;
  }
  
  static float median( int[] series )
  {
    sort( series );
    int len = series.length;
    if ((len & 1) != 0 ) return series[( len / 2 )];  // if odd
    return ( (float)(series[ len / 2 ] + series[ len / 2 + 1 ] )/2.0f); // if even
  }
  
  static float stddev( int[] series )
  {
    float m = mean( series );
    float stddev = 0.0f;
    for ( int i = 0; i<series.length; i++ )
    {
      stddev += (series[i] - m) * (series[i] - m );
    }
    stddev /= (series.length - 1 );
    return sqrt( stddev );
  }
}