Chance and Probability
Chance describes how likely an event is to happen. We use words like impossible, unlikely, even chance, likely, and certain.
What You Need to Know
Key Concept Diagram
Impossible events will never happen (probability = 0)
Certain events will always happen (probability = 1)
Events can be described as unlikely, even chance, or likely
Probability is often shown on a number line from 0 to 1
Key Vocabulary
Probability
A number from 0 to 1 showing how likely an event is
Impossible
An event that cannot happen (probability = 0)
Certain
An event that will definitely happen (probability = 1)
Even chance
An event that is equally likely to happen or not (probability = 0.5)
Knowledge Check
Select the correct answer for each question. Click "Check Answer" to see if you are right.
Question 1
You roll a standard dice. What is the chance of rolling a 7?
Question 2
A bag has 5 red balls and 5 blue balls. What is the chance of picking a red ball?
Question 3
What is the probability of the sun rising tomorrow?
Key Concepts Summary
- ●Impossible events will never happen (probability = 0)
- ●Certain events will always happen (probability = 1)
- ●Events can be described as unlikely, even chance, or likely
- ●Probability is often shown on a number line from 0 to 1