From 980ae332bd5f3b28fc2411fd9da95945391d5e2e Mon Sep 17 00:00:00 2001
From: annurdien <ajwadax@gmail.com>
Date: Mon, 24 Aug 2020 23:04:33 +0700
Subject: [PATCH] Adding a standart deviation algorithm in mathematical
 algorithm Java

---
 .../Java/StandartDeviation.java               | 41 +++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100755 Mathematical Algorithms/Java/StandartDeviation.java

diff --git a/Mathematical Algorithms/Java/StandartDeviation.java b/Mathematical Algorithms/Java/StandartDeviation.java
new file mode 100755
index 0000000..d24fd1e
--- /dev/null
+++ b/Mathematical Algorithms/Java/StandartDeviation.java	
@@ -0,0 +1,41 @@
+public class StandartDeviation {
+
+    private static void standartDeviation(double [] num, String type) {
+
+        double sum = 0;
+        double sd = 0;
+
+        for(int i=0; i<num.length; i++)
+        {
+            sum = sum + num[i];
+        }
+
+        double average = (sum / num.length);
+
+        System.out.println("Sum: " + sum);
+        System.out.println("Average: " + average);
+
+        for (int i=0; i<num.length;i++){
+
+            if (type.toLowerCase().equals("sample")){
+                sd += Math.pow((num[i] - average),2) / (num.length - 1);
+            } else if (type.toLowerCase().equals("population")) {
+                sd += Math.pow((num[i] - average),2) / (num.length);
+            }
+        }
+
+        double standardDeviation = Math.sqrt(sd);
+        System.out.println("This is " + type); 
+        System.out.println("The standart deviation is : " + standardDeviation);
+    }
+
+    public static void main(String[] args) {
+
+        double [] arr = {4,6,8,1,4};
+
+        standartDeviation(arr,"sample");
+        standartDeviation(arr,"population");
+    }
+}
+
+