tribution with
          mean zero and standard deviation one is known as the <span class="emphasis"><em>Standard
          Normal Distribution</em></span>.
        </p>
<p>
          Given mean &#956; &#160;and standard deviation &#963; &#160;it has the PDF:
        </p>
<p>
          &#160;   <span class="inlinemediaobject"><img src="../../../../equations/normal_ref1.svg"></span>
        </p>
<p>
          The variation the PDF with its parameters is illustrated in the following
          graph:
        <