Introduction To Probability
Overview
Probability is the mathematics of chance. Every time you toss a coin, roll a die, draw a card or check tomorrow's weather forecast, you are dealing with uncertainty, and probability gives you a precise way to measure how likely something is. Instead of vague words like likely or unlikely, it puts a number between 0 and 1 on every event.
In this lesson you will meet the probability scale, learn the simple formula that turns counting into probability, and discover the neat shortcut that the chance of something not happening is just one minus the chance that it does. These ideas are the foundation of every probability question you will ever meet, so getting them solid now pays off all the way through the course.
Objectives
- Understand and use the probability scale from 0 to 1.
- Calculate the probability of a single event.
- Understand that the probability of an event not occurring = 1 - the probability of the event occurring.
- Understand and use probability notation. (Extended only)
Audio Lesson
Listen to this lesson in the app
Mind map
This topic is mapped out so you can see how the ideas connect.
Open the mind map in the app
Flashcards
Quick recall practice on the facts this topic is tested on.
Practise these cards in the app
Lesson Note
Complete Note Available on the Green Bridge App
Get the Green Bridge CBT app on your phone or computer for the complete IGCSE library: past papers, mark schemes, mind maps, flashcards and audio lessons.
Lesson Evaluation
Congratulations on completing the lesson on Introduction To Probability. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- A fair six-sided die is rolled. What is the probability of rolling an even number? A. 1/6 B. 1/3 C. 1/2 D. 2/3 Answer: C
- A fair six-sided die is rolled. What is the probability of not rolling a 6? A. 1/6 B. 1/3 C. 1/2 D. 5/6 Answer: D
- Which of these values cannot be a probability? A. 0 B. 0.45 C. 1 D. 1.3 Answer: D
- The probability that it rains tomorrow is 0.7. What is the probability that it does not rain? A. 0.3 B. 0.7 C. 1.0 D. 1.7 Answer: A
- A bag has 4 red and 6 blue counters. One is taken at random. What is the probability it is red? A. 1/6 B. 2/5 C. 1/2 D. 3/5 Answer: B
Work through these questions in the app
Work through these questions in the app
Recommended Books
Practice Mock Questions
Want to practice mock questions on Introduction To Probability? Download the Green Bridge CBT app to access mock questions and full practice assessments for this topic.
Download The App On Google Playstore
Everything you need to excel in your exams
