Question 602833
48, 65, 57, 54, 61, 57, 52, 61, 57
<pre>
      x          x²
     48        2304  
     65        4225
     57        3249
     54        2916
     61        3721
     57        3249
     52        2704
     61        3721
<u>     57        3249</u>
{{{sum(x)}}}=512 {{{sum(x^2)}}}=29338 


s² = {{{1/(n-1)}}}{{{(sum(x^2)-expr(1/n)*(sum(x))^2)}}} = {{{1/(9-1)}}}{{{(29338-expr(1/9)*(512)^2)}}} = {{{1/8}}}{{{(29338-expr(1/9)*262144)}}} = {{{949/36}}} = 26.36111111

Edwin</pre>