# Help- Venn diagrams

Watch
Announcements
#1
In a group of 31 students, 7 study both Art and Biology.
14 study Biology but not Art.
7 study neither subject.
Given that a randomly selected student studies Art, what is the probability the student studies Art and Biology?
0
5 months ago
#2
(Original post by Keira444)
7 study both Art and Biology.
?

Just do 7/31 and that's the probability, I guess.
0
5 months ago
#3
(Original post by Ash-M :))
?

Just do 7/31 and that's the probability, I guess.
This doesn't take into account the bit that says "Given that a randomly selected student studies Art".

Questions like this are usually very easy once the Venn diagram has been drawn. Is there any help needed with that part?
0
5 months ago
#4
(Original post by Pangol)
This doesn't take into account the bit that says "Given that a randomly selected student studies Art".

Questions like this are usually very easy once the Venn diagram has been drawn. Is there any help needed with that part?
Oops your right, I didn't see that bit. In that case P(Art n Bio) I P(A)
So use the conditional probability formula:
P(Art n Bio) / P(A)
0
5 months ago
#5
(Original post by Ash-M :))
Oops your right, I didn't see that bit. In that case P(Art n Bio) I P(A)
So use the conditional probability formula:
P(Art n Bio) / P(A)
The probability of Art and Biology divided by the probability of just Art
0
5 months ago
#6
Since this has been tagged as GCSE level, I doubt that use of the conditional probability formula is required.

0
X

new posts
Back
to top
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### Poll

Join the discussion

#### Do you think receiving Teacher Assessed Grades will impact your future?

I'm worried it will negatively impact me getting into university/college (18)
40%
I'm worried that I’m not academically prepared for the next stage in my educational journey (4)
8.89%
I'm worried it will impact my future career (2)
4.44%
I'm worried that my grades will be seen as ‘lesser’ because I didn’t take exams (11)
24.44%
I don’t think that receiving these grades will impact my future (5)
11.11%
I think that receiving these grades will affect me in another way (let us know in the discussion!) (5)
11.11%