Quadratic mean

MATH-1199

src/main/java/org/apache/commons/math3/stat/descriptive/SynchronizedDescriptiveStatistics.java

@@ -114,6 +114,14 @@ public class SynchronizedDescriptiveStatistics extends DescriptiveStatistics {
         return super.getStandardDeviation();
     }
 
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public synchronized double getQuadraticMean() {
+        return super.getQuadraticMean();
+    }
+
     /**
      * {@inheritDoc}
      */

src/main/java/org/apache/commons/math3/stat/descriptive/SynchronizedSummaryStatistics.java

@@ -111,6 +111,14 @@ public class SynchronizedSummaryStatistics extends SummaryStatistics {
         return super.getStandardDeviation();
     }
 
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public synchronized double getQuadraticMean() {
+        return super.getQuadraticMean();
+    }
+
     /**
      * {@inheritDoc}
      */