Preview Only
Already a member? Sign In
Hope you enjoyed the video!
Thanks for watching!
You have remaining on your free trial.
4 Free Lessons Left
Get unlimited access to all videos and lesson plans with a membership.
So you can keep watching more great videos in class, ask your teacher or principal to get a School plan membership.
We hope you enjoyed trying 5 lessons!
Become a member to get full access to our entire library of learning videos, reading material, quiz games, simple DIY activities & more.
Become a member to get full access to our entire library of learning videos, quiz games, & more.
Plans & Pricing
We now offer home science kits so you can do fun experiments at home.
Explore the KitCreate a free account to continue watching
Teacher
Parent
Student
Facebook/Instagram
Pinterest
Web Search
Email
YouTube
TV Commercial
Podcast
TikTok
Other
Already a member? Sign In
Welcome to Our New Math Lessons!
Your subscription is currently only to our science lessons.
5 Free Math Lessons Left
Add Math To My Plan (+$50/yr)We hope you enjoyed sampling 5 Math Lessons!
Your subscription is currently only to our science lessons.
Add Math To My Plan (+$50/yr)0 Free Math Lessons Left
Create a free account
to watch this full video.
* no credit card needed *
Try it Free Continue with preview
Oops! It looks like your security settings are blocking this video 🙁
If you are on a school computer or network, ask your tech person to whitelist these URLs:
*.wistia.com, fast.wistia.com, fast.wistia.net, embedwistia-a.akamaihd.net
Sometimes a simple refresh solves this issue. If you need further help, contact us.
1:00 min of preview left 
Create a free account for full access 
Create a free account for full access Create a free account to unlock all content!
Get Full AccessNEW! Bring the Fun Home with Our Epic Science Kits
Explore The KitsProbability: Single Events
LESSON MATERIALS
Generate Student Link
Generate Student Link X
Sorry, student links are only for classroom & school accounts.
If you upgrade to a school account, will fully reimburse your individual plan. School accounts give all students and all teachers unlimited access, both in school and at home.
Please login to generate a student link.
Generate Student Link
Share this link with your students to go right to this lesson without needing an account. Links active for 30 days.
- Show lesson plan & teacher guide
- Show answers to discussion questions
- Show video only
- Allow visiting of other pages
- Hide assessments
Probability: Single Events
What you will learn from this videoWhat you will learn
- We'll learn about the probability of an event happening.
- We will also learn how to PREDICT the chances of an event happening.
- And we'll see how this knowledge can help us compete in sports, be on a game show, and understand bottle tricks!
- Discussion Questions
Before Video
What is a frequency?ANSWERA frequency is a measure of how often something happens. It is often a count of successes for a given number of trials.
Answers will vary.
If an event is likely, then we are pretty sure it will happen, but it may not.
If an event is unlikely, it means it probably won’t happen, but it could.
Some examples are rolling number cubes, flipping coins, shooting baskets, winning a game, and winning the lottery.
After Video
What is a probability?ANSWERProbability is the extent to which something is likely to occur. Probabilities have values between 0 and 1, describing likelihoods from impossible (0) to certain (1).
A probability model describes how probability is distributed amongst all possible outcomes in a sample space. In a uniform probability model, all outcomes are equally likely. In a non-uniform probability model, some outcomes are more likely than others.
A theoretical probability is one you calculate based on the number of outcomes possible and the number of outcomes in the event.
An experimental probability is one you calculate by conducting an experiment and determining the frequency of an event in a fixed number of trials.
Likelihood increases with larger numbers. Since 0.6 is larger than 0.2, it is more likely to snow than to rain.
- Vocabulary
- Probability DEFINE
The extent to which an event is likely to occur. Probability is expressed using numbers between 0 and 1.
- Impossible DEFINE
An event that cannot happen is impossible. Events that are impossible have a probability of 0.
- Likely DEFINE
An event is likely if we are pretty sure it will happen, but it still may not happen. Likely events have probabilities close to 1.
- Unlikely DEFINE
An event is unlikely if we are pretty sure it won’t happen, but it still may happen. Unlikely events have probabilities close to 0.
- Certain DEFINE
An event that will happen for sure is certain. Events that are certain have a probability of 1.
- Equally likely DEFINE
If two events have the same probability, then the events are equally likely. If two outcomes have the same probability, then the outcomes are equally likely.
- Event DEFINE
A set of possible outcomes that result from a particular experiment or situation. For example, when rolling a number cube to move a playing piece, the event “roll 4 or higher” includes the set of outcomes {4, 5, 6}.
- Trial DEFINE
The result of an experiment. For example, when determining the experimental probability of getting heads on a coin flip, each coin flip is a trial.
- Outcome DEFINE
Any potential result in an experiment. For example, when flipping a coin there are two outcomes: {heads, tails}; when rolling a number cube there are 6 outcomes: {1, 2, 3, 4, 5, 6}.
- Frequency DEFINE
The number of times an event happens during an experiment is the frequency of the event.
- Expectation DEFINE
The product of the theoretical probability and the number of trials in the experiment gives the expectation, or expected frequency, for an event in that experiment.
- Experimental probability DEFINE
A probability determined by experimental trials.
- Theoretical probability DEFINE
A probability that is calculated. For events with equally likely outcomes, the theoretical probability is the number of ways the event can happen divided by the total number of outcomes in the sample space.
- Sample space DEFINE
The set of all possible outcomes in an experiment.
- Law of Large Numbers DEFINE
As the number of trials in an experiment increases, the experimental probability gets closer to the theoretical probability. So, if you want to determine the probability of an event using an experiment, you need a lot of trials to get an accurate value of the experimental probability.
- Probability DEFINE
- Reading Material
- Practice Word Problems
- Practice Number Problems
- Lesson Plan
- Teacher Guide
Explore Our Science Topics
