From bb5b50dea2a6781c1eb8a0c003d0d1839d1319e0 Mon Sep 17 00:00:00 2001
From: Raghav Taneja <97575679+RaghavTaneja@users.noreply.github.com>
Date: Sun, 29 May 2022 03:16:04 -0500
Subject: [PATCH] Add Z-Score Algorithm (#3065)

Co-authored-by: Andrii Siriak <siryaka@gmail.com>
---
 .../thealgorithms/maths/StandardScore.java    |  9 +++++++
 .../maths/StandardScoreTest.java              | 27 +++++++++++++++++++
 2 files changed, 36 insertions(+)
 create mode 100644 src/main/java/com/thealgorithms/maths/StandardScore.java
 create mode 100644 src/test/java/com/thealgorithms/maths/StandardScoreTest.java

diff --git a/src/main/java/com/thealgorithms/maths/StandardScore.java b/src/main/java/com/thealgorithms/maths/StandardScore.java
new file mode 100644
index 000000000..fc794e1ec
--- /dev/null
+++ b/src/main/java/com/thealgorithms/maths/StandardScore.java
@@ -0,0 +1,9 @@
+package com.thealgorithms.maths;
+
+public class StandardScore {
+	public static double zScore(double num, double mean, double stdDev)
+	{
+		double z = (num - mean)/stdDev;
+		return z;
+	}
+}
diff --git a/src/test/java/com/thealgorithms/maths/StandardScoreTest.java b/src/test/java/com/thealgorithms/maths/StandardScoreTest.java
new file mode 100644
index 000000000..3ff05007f
--- /dev/null
+++ b/src/test/java/com/thealgorithms/maths/StandardScoreTest.java
@@ -0,0 +1,27 @@
+package com.thealgorithms.maths;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class StandardScoreTest{
+  @Test
+  void test1()
+  {
+    Assertions.assertEquals(StandardScore.zScore(2, 0, 5), 0.4);
+  }
+  @Test
+  void test2()
+  {
+    Assertions.assertEquals(StandardScore.zScore(1, 1, 1), 0.0);
+  }
+  @Test
+  void test3()
+  {
+    Assertions.assertEquals(StandardScore.zScore(2.5, 1.8, 0.7), 1.0);
+  }
+  @Test
+  void test4()
+  {
+    Assertions.assertEquals(StandardScore.zScore(8.9, 3, 4.2), 1.4047619047619049);
+  }
+}