IP Maths Notes (Lower Sec, Year 1-2): 10) Probability Models

Q: What does IP Maths Notes (Lower Sec, Year 1-2): 10) Probability Models cover?
A: Construct sample spaces, tree diagrams, and evaluate independent and dependent events with clear notation.

Probability measures uncertainty. This final post develops sample space construction, event notation, and multi-stage probability models.

Learning targets

• Express probabilities as fractions, decimals, or percentages with denominator greater than zero.
• Build sample spaces for single and combined events.
• Draw tree diagrams to track independent and dependent events.
• Apply complementary probability and conditional reasoning.

1. Probability basics

• Probability of event $A$: $P(A) = \dfrac{\text{number of favourable outcomes}}{\text{total outcomes}}$