CBSE 9 Math · U6

Statistics and Probability

CBSE Class 9 Mathematics Unit VI: graphical representation of data, measures of central tendency including weighted average, stacked and 100% stacked bar graphs, empirical probability, theoretical probability, tables, and tree diagrams.

Test yourself

A focused, distraction-free run through 60 multiple-choice questions. Hints if you need them; your score at the end.

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Difficulty guide

The label describes the problem, not your ability.

1/5 - Foundational

Warm-up setup; checks one basic idea.

2/5 - Routine exam skill

Normal syllabus skill; usually one main rule or interpretation.

3/5 - Standard multi-step

Exam-style problem with multiple steps or a common trap.

4/5 - Hard exam skill

High-end exam problem; combines methods carefully.

5/5 - Challenge

Stretch problem beyond normal exam pressure.

Topic 6.1

Data Organisation and Graphs

Collecting, organising, visualising and interpreting data using tables, histograms, stacked bars and 100% stacked bars.

Topic 6.2

Mean and Weighted Average

Mean from raw and frequency data, weighted average, combined mean, and interpreting the effect of changes in data.

Topic 6.3

Median, Mode and Choice of Average

Median, mode, effect of extreme values, and deciding which measure of central tendency is most appropriate.

Topic 6.4

Empirical Probability and Randomness

Probability scale, randomness, empirical probability from observed data, repeated trials, and judging simulation claims.

Topic 6.5

Theoretical Probability, Tables and Trees

Sample spaces, events, theoretical probability, complements, tree diagrams and two-stage tables.

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