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9 Descriptive Statistics

9.1 Introduction
9.2 Some basic definitions
9.3 Frequency distribution
9.3.1 Class boundaries and the width of an interval
9.4 Histograms
9.4.1 Modal class
9.5 Frequency polygons
9.6 Cumulative frequency curves (ogives)
9.7 Measures of central tendency
9.7.1 The arithmetic mean
9.7.2 Assumed mean
9.7.3 Mean of a grouped distribution
9.8 The median
9.8.1 Median for grouped data
9.9 The mode
9.9.1 Mode for grouped data
9.10 Measures of dispersion
9.10.1 Range
9.10.2 Mean deviation
9.10.3 Standard deviation
9.10.4 Variance

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