java - Standard Deviation -

hi have created code calculate standard deviation of set of numbers, here code below:

public class standarddev {  public static void main(string[] args) {     scanner in = new scanner(system.in);     int n = in.nextint();     int[] arr = new int[n];     double sum = 0.0;     for(int = 0; < n; i++) {         arr[i] = in.nextint();     }     arrays.sort(arr);     double median = n % 2 != 0 ? arr[n/2] : (arr[n/2] + arr[(n/2)-1])/2;     for(int = 0; < n; i++) {         sum += math.pow(arr[i] - median,2);     }     system.out.printf("%.1f", math.sqrt(sum/n));  } } 

however when input this:

10

64630 11735 14216 99233 14470 4978 73429 38120 51135 67060

i different result expected answer. output: 30475.6 expected output: 30466.9

but if tried input below correct answer:

5

10 40 30 50 20

my output: 14.1

expected output: 14.1

rewrote code calculate standard deviation, based on mean:

import java.util.*; import java.lang.*; import java.io.*;  class standarddev {     public static void main(string[] args) {         scanner in = new scanner(system.in);         int n = in.nextint();         int[] arr = new int[n];         double sum = 0.0;         double mean = 0;         for(int = 0; < n; i++) {             arr[i] = in.nextint();             mean += arr[i];         }         mean /= n;         for(int = 0; < n; i++) {             sum += math.pow(arr[i] - mean,2);         }         system.out.printf("%.1f", math.sqrt(sum/n));    } } 

example: http://ideone.com/qy1wkw