Unit 7 · Class 10 IB MYP · Formula Sheet

Statistics (Standard Deviation) Formulas — Class 10 IB MYP

Calculate variance and standard deviation; compare data sets using statistical measures.

Key Formulas

Mean

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

Variance

\sigma^2 = \dfrac{\sum f_i(x_i - \bar{x})^2}{\sum f_i}

Standard Deviation

\sigma = \sqrt{\dfrac{\sum f_i(x_i - \bar{x})^2}{\sum f_i}}

Alternative Variance

\sigma^2 = \dfrac{\sum f_i x_i^2}{\sum f_i} - \bar{x}^2

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 10 IB MYP Statistics (Standard Deviation)?+
There are 4 formulas in the Statistics (Standard Deviation) chapter for Class 10 IB MYP. Each formula is essential for solving problems in this topic.
How to remember Statistics (Standard Deviation) 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 (Standard Deviation) formulas enough for exams?+
Yes, these formulas cover the complete IB MYP Class 10 syllabus for Statistics (Standard Deviation). Practice applying them to different types of questions for full exam readiness.

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