Update Correlation.java

Author: kvadrik

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

@@ -22,10 +22,10 @@ private Correlation() {
      */
     public static double correlation(double[] x, double[] y, int n) {
         double exy = 0;
-		double ex = 0;
-		double exx = 0;
-		double ey = 0;
-		double eyy = 0;
+        double ex = 0;
+        double exx = 0;
+        double ey = 0;
+        double eyy = 0;
         for (int i = 0; i < n; i++) {
             exy += x[i] * y[i];
             ex += x[i];