分散

    public static double getVariance(int[] x){
        //算術平均の算出
        double ave = 0;
        for(int i = 0; i < x.length; i++){
            ave = ave + x[i];
        }
        ave = ave / (x.length);

        //分散の算出
        double sum = 0;
        for(int i = 0; i < x.length; i++){
            sum = sum + (Math.abs(x[i] - ave) * Math.abs(x[i] - ave));
        }
        sum = sum / (x.length);

        return sum;
    }