public static double StandardDeviation(int[] num)
	{
		double SumOfSqrs = 0;
		double avg = Average(num);
		for (int i = 0; i < num.length; i++)
		{
			SumOfSqrs += Math.pow(((double)num[i] - avg), 2);
		}
		double n = (double)num.length;
		return Math.sqrt(SumOfSqrs / (n - 1));
	}