Unit 8 · Class 9 IB MYP · Formula Sheet

Statistics (Measures of Spread) Formulas — Class 9 IB MYP

Calculate range, interquartile range, and interpret box plots and cumulative frequency diagrams.

Key Formulas

Range

\text{Max} - \text{Min}

Interquartile Range

\text{IQR} = Q_3 - Q_1

Quartiles

Q_1 = 25\text{th percentile}, \quad Q_3 = 75\text{th percentile}

Mean

\bar{x} = \dfrac{\sum f_i x_i}{\sum f_i}

Worked Examples

1Using: Probability

A die is thrown. Find P(getting an even number).

Step 1: Even outcomes: {2, 4, 6} = 3.

Step 2: Total outcomes = 6.

Step 3: P = 3/6 = 1/2.

Answer: 1/2

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Frequently Asked Questions

How many formulas are in Class 9 IB MYP Statistics (Measures of Spread)?+
There are 4 formulas in the Statistics (Measures of Spread) chapter for Class 9 IB MYP. Each formula is essential for solving problems in this topic.
How to remember Statistics (Measures of Spread) formulas easily?+
Practice regularly with worked examples, group related formulas together, and use SparkEd's interactive practice mode to reinforce your memory through problem-solving.
Are these Statistics (Measures of Spread) formulas enough for exams?+
Yes, these formulas cover the complete IB MYP Class 9 syllabus for Statistics (Measures of Spread). Practice applying them to different types of questions for full exam readiness.

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