## Venn vill you understand probability? (updated!)

Venn diagrams are a critical part of year 10 probability studies. Why? Well, you’ve already learnt how to calculate simple probability from the defintion formula:

But how do you handle this formula when you have multiple events? You need to understand how those events are related. For this, we introduce the tool of a Venn diagram. Venn diagrams are a visual way of showing set membership, and showing objects which are part of more than one set. It is essential that you become familiar with how venn diagrams operate, and the rules of sets. Here is some information.

This link is an excellent reference to get you into venn diagrams. The youtube clip starts on how probability works with Venn diagrams:

And this is a link to the playlist that goes through all the rest. You will have to decide what you need to watch; but remember, if it’s here, it’s fair game to be tested…

And speaking of tests: Here is one for you to practice with: link

Update: A new link into some fascinating venn diagrams in the Age!

See you in class!

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### 20 Comments on “Venn vill you understand probability? (updated!)”

1. Nurul Khan Says:

I like Venn diagrams because they are a visual way of showing set membership, and showing objects which are part of more than one set which makesn it easy to understand.

2. Stephanie Bonilla Says:

Well, following up on what nurul said in the previous comment, It is important that we are familiar with how venn diagrams work, and the rules of sets.I like how the website http://www.purplemath.com/modules/venndiag.htm
shows me the steps and ways to understand Venn Diagrams much better.

3. Brendan Says:

The “Information” link was really helpful with some of the definitions I still wasnt 100% sure on yet and the PurpleMath site was good for the same thing too. Anyone else who still needs help should check out this site:
http://www.mathsteacher.com.au/year10/ch05_probability/04_probability/prob.htm
It has some good info and theres more links down the bottom for you to look at!
– Brendan! đ

4. Anthony Vuong Says:

The practise test helped me a little bit, but I think I need to study more on this area of maths. I am struggling in this topic. It is hard to understand intercetion and union.

• Michelle Says:

Remember:
Intersection is BOTH
(Think of it as they “intersect” A and B)
Union is either (Think of a job union there are many, you can chose “either”)
The symbol for union is U and intersection is the upside down U.

Here is a website helpful:

It has a brief, easy to understand description of union and intersection.

5. Emmalie Robertson Says:

The youtube video helped me understand mutually excluseive events, independent events and complementary events more. The practise test helped me with intercetion and union.

6. Rachel Says:

Video 10 really helped me understand 3 set venn diagrams. It explains it really well. Part 2 of that video is also good.

7. Michelle Says:

I found the video helpful, especially the explanation of the last question, whether A and B were complementary events.

8. Jack Says:

The practice test was very good for allowing me to put my understanding of ven diagrams into action. Also the chart from purplemaths (pg 2) is excellent bound reference material! Thank you!

9. Jason Says:

the clip is helpfull, but i need more practice on the union and intercetion and drawing up three way venn diagrams.

10. Brodey Leggett Says:

I thought that the link that Steph posted was really helpfull in understanding venn diagrams but i am still a bit unsure about the bit were you have to shade in a cirtain region of the venn diagram that the equation gives you.

11. Brendan Says:

Hi MrG. I wanted to know if chapter 11F Subjective Probabilty was essential and due on Monday, or whether we could skip it. I dont think that its essential but I thought I should check. Thanks! : )

• CyberChalky Says:

Hi Brendan,

The whole point is that you select questions you need; this is your choice.

I expect that you will spend some time on 11F; you decide how much you need

12. Deanna Says:

I did the practise test and i found it pretty easy. Though it just refreshed my memory on sets and notations.

13. Danielle Brohier Says:

This topic is a bit easier now but I find it a bit confusing when we have to shade in whats ‘not’ the product of A or B or A and B.

• CyberChalky Says:

Hi Danielle,

Excellent to see you using the blog! The complement diagram (“not the product”) is easiest to do if you draw the product, and then shade the opposite of it.