//File:	NumberList.java
//This class will gather together in one place
//functions (or methods) which process lists of
//numbers (int or double).
import iostuff.*;
public class NumberList
{
	//The following two methods calculate the average of a list
	//of int's or double's respectively
	public static int average (int [] a)
	{
		int sum=0;
		for (int k=0; k<a.length; k++)
		{
			sum = sum + a [k];
		}
		return sum/a.length;
	}
	
	public static double average (double [] a)
	{
		double sum=0;
		for (int k=0; k<a.length; k++)
		{
			sum = sum + a [k];
		}
		return sum/a.length;
	}
	
	public static int sd (int [] a, int average)
	{
		int sum=0;
		for (int k=0; k<a.length; k++)
		{
			sum = sum + (a[k]-average) * (a[k]-average);
		}
		return (int) Math.sqrt(sum/a.length);
	}
}