java homework

使用java.lang.Math类，生成500个0~99的随机数，进行排序输出，并求最大值、最小值、平均值、标准差、方差、均方差；
import java.lang.Math;
import java.util.Arrays;
public class Main {
public static void main(String args[]) {
//create random
int [] data =new int[500];
double sum = 0, avg =0;
System.out.println("DATE:");
for(int i=0; i<500; ++i) {
data[i] = (int ) (Math.random() * 100);
System.out.print(data[i] + "\t");
if(0==(i+1)%8)
System.out.println();
}
System.out.println("\nAfter sort:");
//sort
Arrays.sort(data);
for(int i=0; i<500; ++i) {
sum += data[i];
System.out.print(data[i] + "\t");
if(0==(i+1)%8)
System.out.println();
}
System.out.println();
avg = sum/(500);
double sum2= 0;
for(int i=0; i<500; ++i) {
sum2 += Math.pow((double)data[1] - avg,2);
}
double var = sum2 / 500;
double sd = Math.sqrt(var);
System.out.println("Min:" + data[0]);
System.out.println("Max:" + data[499]);
System.out.println("Variance:" + var);
System.out.println("Sd:"+ sd);
}
}