## Range, variance, standard deviation

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.

## IQR and Boxplots

This Concept introduces students to the some of the measures of spread commonly used, such as range, standard deviation and variance.
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## Measures of Spread or Dispersion

Describe what happens to the measures of central tendency and dispersion when new data points are added to a data set.
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Describe what happens to the measures of central tendency and dispersion when new data points are added to a data set.
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## Mean and Deviation

Learn to understand the mean and different statistical deviations.
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## Measures of Spread - Standard Deviation

Describe what happens to the measures of central tendency and dispersion when new data points are added to a data set.
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