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diff --git a/src/main/java/org/apache/commons/math3/stat/descriptive/StatisticalSummary.java b/src/main/java/org/apache/commons/math3/stat/descriptive/StatisticalSummary.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.commons.math3.stat.descriptive;
+
+/**
+ *  Reporting interface for basic univariate statistics.
+ *
+ */
+public interface StatisticalSummary {
+
+    /**
+     * Returns the <a href="http://www.xycoon.com/arithmetic_mean.htm">
+     * arithmetic mean </a> of the available values
+     * @return The mean or Double.NaN if no values have been added.
+     */
+    double getMean();
+    /**
+     * Returns the variance of the available values.
+     * @return The variance, Double.NaN if no values have been added
+     * or 0.0 for a single value set.
+     */
+    double getVariance();
+    /**
+     * Returns the standard deviation of the available values.
+     * @return The standard deviation, Double.NaN if no values have been added
+     * or 0.0 for a single value set.
+     */
+    double getStandardDeviation();
+    /**
+     * Returns the maximum of the available values
+     * @return The max or Double.NaN if no values have been added.
+     */
+    double getMax();
+    /**
+    * Returns the minimum of the available values
+    * @return The min or Double.NaN if no values have been added.
+    */
+    double getMin();
+    /**
+     * Returns the number of available values
+     * @return The number of available values
+     */
+    long getN();
+    /**
+     * Returns the sum of the values that have been added to Univariate.
+     * @return The sum or Double.NaN if no values have been added
+     */
+    double getSum();
+
+}