title: Summation in EXCEL for calculation of standard deviation
body: <p>Suppose that i want manually calculate <code>sample standard deviation</code>. As you know we have this formula to do this :</p>
  
  <p><img src="https://i.stack.imgur.com/HzHN6.png" alt="enter image description here"></p>
  
  <p>I'm using this function in <code>EXCEL</code> to do this : ( data  range : <code>E3:E32</code> )</p>
  
  <pre><code>=SQRT((E3-GEOMEAN($E$3:$E$32))^2/(COUNT($E$3:$E$32)-1))
  </code></pre>
  
  <p>But this function calculate <code>standard deviation</code> for every cell (here <code>E3</code>). I need a summation like the above formula.( + this is a manual function to calculate standard deviation using <code>geometric mean</code>). How can I do that in <code>EXCEL</code> ?</p>
  
  <p>Thanks.</p>