void number(double[] data, int count) {
        this.data = data;
        size = count;
    }

    double getMean() {
        double sum = 0.0;
        for (double a : data)
            sum += a;
        return sum / size;
    }

    double getVariance() {
        double mean = getMean();
        double temp = 0;
        for (double a : data)
            if(a == 0.0){

            }else{
            temp += Math.pow(a-mean,2);
            }
        return temp / size;
    }

    double getStdDev() {
        return Math.sqrt(getVariance());
    }


    public void homework(String[] args) {

        TextIO txtIO = new TextIO();
        int num = 0;
        int count = 0;
        double sum = 0.0;

        boolean end = false;
        while (end == false) {
            double[] pole = new double[10];
            for (int i = 0; count < pole.length; count++) {
                String line = txtIO.getLine();
                num++;
                if (line.length() > 0 && txtIO.isDouble(line)) {
                    sum = Double.parseDouble(line);
                    if(count < 2){

                    }else{
                    pole[count] = sum;
                    }
                }else{
                if (line.equals("")) {
                    System.err.println("End of input detected!");
                    end = true;
                    break;

                }

                }


            }
            number(pole, count);
            System.out.printf(" "+count+" %.3f %.3f\n", getMean(), getStdDev());
            count = 0;


        }

    }