Lesson · Grade 7 · Mathematics
What Independent Events Are
- Grade 7
- Mathematics
- 58 s
- British Columbia
- BC7-MA-68
A coin is flipped and a spinner with 4 equal parts is spun, and the chance of landing on pink is 1 out of 4. Whether the coin lands heads or tails, the chance of pink stays 1 out of 4, which shows that the two events are independent.
Anyone can watch two lessons on the website without an account. Signing in is free, no payment and no card, and opens three a day; Plus has no limit.
Loading
In one sentence
The question this lesson answers
What does it mean for two events to be independent?
Let us flip a coin, and then spin a spinner.
Transcript
What the lesson says
What does it mean for two events to be independent?
Let us flip a coin, and then spin a spinner.
Getting heads is one event, and landing on pink is another.
The spinner has 4 equal parts, and 1 of them is pink.
So the chance of landing on pink is 1 out of 4, or one quarter.
Does the coin change the chance of pink?
If the coin lands heads, the spinner still has 1 pink part out of 4.
If it lands tails, the chance of pink is still 1 out of 4.
The coin cannot change the spinner, so the chance of pink stays the same.
So getting heads and landing on pink are independent events.
Two events are independent when one does not change the chances of the other.
Curriculum
Where this fits
- British Columbia, Grade 7
Mathematics, Data and probability: experimental probability with two independent eventsBC7-MA-68
Previous: Experimental and Theoretical Probability: Flip a Coin, Roll a DieNext: All the Outcomes of Two Spins: Tables and Tree Diagrams
The outcomes and strands follow the British Columbia curriculum.
Keep going
1 min 23 sAll the Outcomes of Two Spins: Tables and Tree Diagrams
Grade 7 · 1 min 23 s
1 min 47 sBias in a Survey: Leading Questions and Unfair Samples
Grade 9 · 1 min 47 s
1 minBlock Graphs: Which Row Is Longer?
Grade 1 · 1 min
1 min 58 sChoosing the best average: mean, median or mode
Grade 8 · 1 min 58 s
1 min 56 sChoosing the right graph for the data
Grade 10 · 1 min 56 s
1 min 50 sCollecting Data Fairly: Privacy, Consent, Timing and Cost
Grade 9 · 1 min 50 s
55 sCould It Snow Tomorrow? Likely or Unlikely
Kindergarten · 55 s
1 min 27 sDouble bar graphs with a scale
Grade 5 · 1 min 27 s
- All Grade 7 Mathematics lessons
- Teachers: the maths worksheets for Grade 7 are in the dashboard, each with a worked example and a proven answer key.
- Try the graph paper, free for everyone, no account needed.
- Create a free account to watch three lessons a day, no payment and no card.