title: Commons Math - could not find class org.apache.commons
body: <p>I have downloaded the binary Zip from <a href="http://commons.apache.org/proper/commons-math/download_math.cgi" rel="nofollow">here</a>. I extracted the zip to a folder. Then I right clicked on <code>libs</code> folder in Eclipse. I Imported the *.jar file to the <code>libs</code> folder, and then I right clicked on it and <code>added to path</code>. I added</p>
  
  <pre><code> import org.apache.commons.math3.stat.descriptive.DescriptiveStatistics;
  </code></pre>
  
  <p>to my java file, and i am adding values to</p>
  
  <pre><code>DescriptiveStatistics rStandardDeviation = new DescriptiveStatistics();
  </code></pre>
  
  <p>and after that I run the math part by:</p>
  
  <pre><code>double bMean = bStandardDeviation.getMean();
  double rStd = rStandardDeviation.getStandardDeviation();
  </code></pre>
  
  <p>No errors on compile, clean, or build. When I attempt to run the app on my phone i get:</p>
  
  <pre><code>Could not find class 'org.apache.commons.math3.stat.descriptive.DescriptiveStatistics', referenced from method com.example.mydemo.MainActivity.&lt;init&gt;
  </code></pre>
  
  <p>Any ideas anyone what is going wrong?</p>
  
  <p>Thank you</p>