public class DataSet {
    
    public DataSet() {
        largest = Integer.MIN_VALUE;
        smallest = Integer.MAX_VALUE;
        sumData = 0;
        numData = 0;
    }
    
    public void addValue( int x ) {
        largest = Math.max( largest, x );
        smallest = Math.min( smallest, x );
        sumData += x;
        ++ numData;
    }
    
    public int getLargest() {
        return largest;
    }
    
    public int getSmallest() {
        return smallest;
    }

    public int size() {
        return numData;
    }

    public double average() {
        double avg = 0;
        if( numData > 0 ) {
            avg = (double) sumData / numData;
        }
        return avg;
    }

    private int largest;
    private int smallest;
    private int sumData;
    private int numData;
}