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Activity- statistics problems (view source)
Revision as of 06:33, 14 August 2014
, 06:33, 14 August 2014→Solution:
A=assumed average.<br>
A=assumed average.<br>
c=4<br>
c=4<br>
d=<math>\frac{x-A}{c}</math><br>
d=<math>\frac{x-A}{c}</math>=<math>\frac{32-40}{4}</math>=<math>\frac{-8}{4}=-2</math><br>
assumed mean A=<math>\frac{\sum fx}{n}</math>=<math>\frac{1668}{40}=41.7</math><br>
assumed mean A=<math>\frac{\sum fx}{n}</math>=<math>\frac{1668}{40}=41.7</math><br>
Varience σ²=[<math>\frac{\sum {fd^2}}{n}-({\frac{\sum fx}{n})^2}]c^2</math> <br>
σ²=[<math>\frac{85}{40}-({\frac{17}{40})^2}]4^2</math> <br>
σ²=[<math>\2.125-0.180]16</math> <br>
Standard deviation σ=<math>\sqrt{\frac {\sum {fx^2}}{n}-({\frac{\sum fx}{n})^2}}</math> <br>
Standard deviation σ=<math>\sqrt{\frac {\sum {fx^2}}{n}-({\frac{\sum fx}{n})^2}}</math> <br>