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Population standard deviation of grades of eight students: Add math notation of explanation
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===Population standard deviation of grades of eight students=== |
===Population standard deviation of grades of eight students=== |
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Suppose that the entire population of interest is eight students in a particular class. For a finite set of numbers, the population standard deviation is found by taking the [[square root]] of the [[average]] of the squared deviations of the values subtracted from their average value. The marks of a class of eight students (that is, a [[statistical population]]) are the following eight values: |
Suppose that the entire population of interest is eight students in a particular class. For a finite set of numbers, the population standard deviation is found by taking the [[square root]] of the [[average]] of the squared deviations of the values subtracted from their average value, that is: |
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<math display="block">\sigma = \sqrt{ average([values_i - average(values)]^2) }</math> |
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The marks of a class of eight students (that is, a [[statistical population]]) are the following eight values: |
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<math display="block">2,\ 4,\ 4,\ 4,\ 5,\ 5,\ 7,\ 9</math> |
<math display="block">2,\ 4,\ 4,\ 4,\ 5,\ 5,\ 7,\ 9</math> |
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