The Normal Distribution


The normal distribution is a fascinating, naturally occurring phenomenon that has very relevant applications to understanding the world around us. When a data set is normally distributed it has some key properties that allow us to make predictions about the nature of the data set. The videos below go in to detail about those properties and how to use them to solve problems.

Learn about it

The following is a series of slides and videos that will help you understand, learn about and review this sub-topic.

Keep track of your progress and practice the exam questions on this Normal Distribution activity sheet.

Slides Gallery

Use these slides to review the material and key points covered in the videos.

What is the normal distribution?

This video intoduces the idea of data sets and distributions leading to the key properties.

The symmetry and structure of the Normal Distribution

Here we look at the fundamental symmetrical properties and how we use them to solve problems.

The Normal CD function.

This video goes through using your GDC and the Normal CDF function to solve problems

The Inverse Normal function.

This video goes through using your GDC and the Inverse Normal function to solve problems


This section of the page can be used for quick review. The flashcards help you go over key points and the quiz lets you practice answering questions on this subtopic.

Flash Cards

Review these condensed 'key point' flashcards to help you check and keep ideas fresh in your mind.


Practice your understanding on these quiz questions. Check your answers when you are done and read the hints where you got stuck. If you find there are still some gaps in your understanding then go back to the videos and slides above.

Exam Style Questions

The following questions are based on IB exam style questions from past exams. You should print these off (from the document at the top) and try to do these questions under exam conditions. Then you can check your work with the video solution.

Question 1

Question 2

Question 3