IGCSE 0580 Statistics

Statistics Visual Questions

Interactive practice with histograms, cumulative frequency curves, box plots, scatter diagrams and pie charts. Hover over chart elements to read values, then answer the question.

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Question 1 of 13

Box Plot

Hover or tap on chart elements for values

Calculate the interquartile range (IQR) from this box plot.

IGCSE Statistics Exam Tips

Cumulative frequency — always plot at upper boundaries

The cumulative frequency is the running total up to the end of each class. Always plot points at the upper class boundary, not the midpoint. Start your curve at (lower boundary, 0).

Finding the median from a cumulative frequency curve

Total frequency ÷ 2 gives the median position. Draw a horizontal line from this value to the curve, then read down to the x-axis. For Q1 use n/4, for Q3 use 3n/4.

Box plots — five key values

A box plot shows: minimum, lower quartile (Q1), median, upper quartile (Q3), and maximum. The IQR = Q3 − Q1. The range = max − min.

Describing scatter diagrams

Use the correct language: positive correlation (both increase), negative correlation (one increases, other decreases), no correlation (no pattern). Always mention the strength: strong, moderate, or weak.

Pie chart angles must total 360°

To find the angle for a category: (frequency ÷ total frequency) × 360°. To find frequency from an angle: (angle ÷ 360°) × total frequency. Always check your angles sum to 360°.

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