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Payment.java
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Payment.java
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package random;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Random;
import java.util.Scanner;
import java.util.Set;
public class Payment {
Set<Integer> setInt = new HashSet<Integer>();
ArrayList<Integer> intArr = new ArrayList<Integer>();
ArrayList<Integer> payArr = new ArrayList<Integer>();
int i;
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
int n = scan.nextInt();
Payment p = new Payment();
p.calculatePay(n);
}
private void calculatePay(int n) {
for (i = 1; i <= n; i++) {
setInt.add(i);
}
int c = 0;
while (c < n) {
int num = randInt(n);
if (setInt.contains(num) && !intArr.contains(num)) {
intArr.add(num);
setInt.remove(num);
c++;
}
}
int sum = intArr.get(0);
payArr.add(sum);
for (i = 1; i < intArr.size(); i++) {
int pay = (intArr.get(i) - intArr.get(i - 1)) > 0 ? intArr.get(i) - intArr.get(i - 1)
: -1 * (intArr.get(i) - intArr.get(i - 1));
sum += pay;
payArr.add(pay);
}
System.out.println("Total payment = " + sum);
double mean = ((1d) * sum) / payArr.size();
System.out.println("Mean of the payment= " + mean);
System.out.println("Standard Deviation of the payments = " + findSD(payArr, mean));
}
private double findSD(ArrayList<Integer> nums, double mean) {
double sd = 0;
for (int i = 0; i < nums.size(); i++) {
sd += Math.pow((nums.get(i) - mean), 2) / nums.size();
}
return Math.sqrt(sd);
}
public static int randInt(int n) {
Random rn = new Random();
int randomNum = rn.nextInt(n + 1);
return randomNum;
}
}