File	Doc	Category	Size	Date	Package
Averager.java	API Doc	Example	2085	Mon Sep 22 13:30:30 BST 1997	None

Averager

• java.lang.Object

Fields Summary
private int	n
private double	sum
private double	sumOfSquares

Constructors Summary

Methods Summary
public void	addDatum(double x) This method adds a new datum into the average. n++; sum += x; sumOfSquares += x * x;
public double	getAverage() This method returns the average of all numbers passed to addDatum() return sum / n;
public double	getNum() This method returns the number of numbers passed to addDatum() return n;
public double	getStandardDeviation() This method returns the standard deviation of the data return Math.sqrt(((sumOfSquares - sum*sum/n)/n));
public double	getSum() This method returns the sum of all numbers passed to addDatum() return sum;
public double	getSumOfSquares() This method returns the sum of the squares of all numbers. return sumOfSquares;
public void	reset() This method resets the Averager object to begin from scratch n = 0; sum = 0.0; sumOfSquares = 0.0;