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17 package org.apache.commons.math.distribution;
18
19 /**
20 * Normal (Gauss) Distribution.
21 * Instances of NormalDistribution objects should be created using
22 * {@link DistributionFactory#createNormalDistribution(double, double)}.<p>
23 *
24 * <p>
25 * References:<p>
26 * <ul>
27 * <li><a href="http://mathworld.wolfram.com/NormalDistribution.html">
28 * Normal Distribution</a></li>
29 * </ul>
30 * </p>
31 *
32 * @version $Revision: 201915 $ $Date: 2005-06-26 15:20:57 -0700 (Sun, 26 Jun 2005) $
33 */
34 public interface NormalDistribution extends ContinuousDistribution {
35 /**
36 * Access the mean.
37 * @return mean for this distribution
38 */
39 double getMean();
40 /**
41 * Modify the mean.
42 * @param mean for this distribution
43 */
44 void setMean(double mean);
45 /**
46 * Access the standard deviation.
47 * @return standard deviation for this distribution
48 */
49 double getStandardDeviation();
50 /**
51 * Modify the standard deviation.
52 * @param sd standard deviation for this distribution
53 */
54 void setStandardDeviation(double sd);
55 }