Unit 9 · Class 8 IB MYP · Formula Sheet

Probability (Theoretical) Formulas — Class 8 IB MYP

Calculate theoretical probability using sample spaces, tree diagrams, and organized lists.

Key Formulas

Probability

P(E) = \dfrac{n(E)}{n(S)}

Complement

P(\bar{E}) = 1 - P(E)

Tree Diagrams

P(A \text{ and } B) = P(A) \times P(B) \text{ (independent)}

Addition Rule

P(A \text{ or } B) = P(A) + P(B) - P(A \text{ and } B)

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 8 IB MYP Probability (Theoretical)?+
There are 4 formulas in the Probability (Theoretical) chapter for Class 8 IB MYP. Each formula is essential for solving problems in this topic.
How to remember Probability (Theoretical) 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 Probability (Theoretical) formulas enough for exams?+
Yes, these formulas cover the complete IB MYP Class 8 syllabus for Probability (Theoretical). Practice applying them to different types of questions for full exam readiness.

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