style: include IMC_IMMATURE_CLASS_VAR_NAME (#5197)

Author: vil02

spotbugs-exclude.xml

@@ -216,9 +216,6 @@
     <Match>
         <Bug pattern="FCBL_FIELD_COULD_BE_LOCAL" />
     </Match>
-    <Match>
-        <Bug pattern="IMC_IMMATURE_CLASS_VAR_NAME" />
-    </Match>
     <Match>
         <Bug pattern="CFS_CONFUSING_FUNCTION_SEMANTICS" />
     </Match>

src/main/java/com/thealgorithms/maths/StandardDeviation.java

@@ -5,16 +5,16 @@ private StandardDeviation() {
     }
 
     public static double stdDev(double[] data) {
-        double var = 0;
+        double variance = 0;
         double avg = 0;
         for (int i = 0; i < data.length; i++) {
             avg += data[i];
         }
         avg /= data.length;
         for (int j = 0; j < data.length; j++) {
-            var += Math.pow((data[j] - avg), 2);
+            variance += Math.pow((data[j] - avg), 2);
         }
-        var /= data.length;
-        return Math.sqrt(var);
+        variance /= data.length;
+        return Math.sqrt(variance);
     }
 }