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Quartiles, percentiles and measures of dispersion
Determine the quartiles for a small data set and an ungrouped frequency distribution.
7
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70
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49
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90 min
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CambridgeIGCSEStatisticsQuartiles, percentiles and measures of dispersion
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Quartiles, percentiles and measures of dispersion outcomes7 objectives
- Determine the quartiles for a small data set and an ungrouped frequency distribution.
- Estimate quartiles and percentiles from a cumulative frequency polygon or curve and a grouped frequency distribution using linear interpolation, including estimating frequencies for specific parts of the distribution.
- Calculate the range of a small data set and an ungrouped frequency distribution by finding the difference between the greatest and least values.
- Calculate the interquartile range of a small data set and an ungrouped frequency distribution using the upper and lower quartiles.
- Estimate the interquartile range from a cumulative frequency polygon or curve and a grouped frequency distribution using linear interpolation.
- Calculate the standard deviation of a small data set and an ungrouped frequency distribution using a formula, and estimate the standard deviation for a grouped frequency distribution.
- Understand the pros and cons of each measure of dispersion and justify choosing a specific measure in a given context.
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