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Statistics · EDA

Boxplots and the Five-Number Summary

A bar graph shows numbers as bars. Taller bar = bigger number.

StatisticsCommon Core SP-1.CEDAVerified correct ✓

Worked examples

Data set (sorted): 10, 57, 75, 79, 90, 90, 99. Find the Q1 (first quartile).
Answer: 57
Data set (sorted): 16, 18, 22, 34, 39, 51, 62, 77, 80. Find the Q3 (third quartile).
Answer: 69.5

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Compare Distributions — Shape, Center, Spread, and Outliers (SOCS)

More Statistics topics

Frequency Tables — Relative Frequency and Marginal DistributionsCompare Distributions — Shape, Center, Spread, and Outliers (SOCS)Dot Plots and Histograms — Construct and InterpretMean and Standard Deviation — Compute and InterpretStandardized Scores (z-scores) — Position Within a DistributionNormal Distribution — The 68-95-99.7 Empirical RuleNormal Probability Calculations Using z-tablesFind Values from Percentiles — Inverse Normal