Measures of Variability of Grouped Data

Math - Grade 7 / Statistics and Probability

Sample Question

Which formula is used to find the standard deviation of grouped data?

  • [%\frac{\sum f\left|x-\overline{x}\right|}{N} %]
  • [% \sqrt{\frac{\sum fx^2-\frac{\left(\sum fx\right)^2}{n}}{n-1}} %]
  • [% \frac{\sum\left(X\_i-\overline{X}\right)^2}{N} %]
  • [% \frac{\sum \left(X\_i-\overline{X}\right)}{N} %]

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Math - Grade 7

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