Mathematics, 20.07.2019 20:50 sumitshekhar348
The football coach randomly selected ten players and timed how long each player took to perform a certain drill. the times (in minutes) were:
Answers: 1
![\begin{tabular} {|c|c|c|} x&$x-\bar{x}$&$(x-\bar{x})^2$\\[1ex] 7.2&-2.3&5.29\\10.5&1&1\\9.9&0.4&0.16\\8.2&-1.3&1.69\\11.0&1.5&2.25\\7.3&-2.2&4.84\\6.7&-2.8&7.84\\11.0&1.5&2.25\\10.8&1.3&1.69\\12.4&2.9&8.41\\[1ex] \Sigma x=95&&$\Sigma(x-\bar{x})^2=35.42$ \end{tabular}\\ \\ \bar{x}=\frac{\Sigma x}{n}=\frac{95}{10}=9.5\\ \\ s= \sqrt{\frac{\Sigma(x-\bar{x})^2}{n-1}} = \sqrt{\frac{35.42}{9} }=\sqrt{3.94}=1.98](/tpl/images/0113/0034/00955.png)
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