You are Here: Home >< Maths

# S1 question

Announcements Posted on
Last day to win £100 of Amazon vouchers - don't miss out! Take our quick survey to enter 24-10-2016
1. this question is really ****ing pissing me off, I just cant do it. edexcel ****ers decide to mind**** students with this question

https://1a388b28f5ce9318f837a64962fc...%20Edexcel.pdf

question 5
2. Draw your Venn diagram. Put in the information you know and then work from there using your knowledge of how Venn diagrams work applied to the information you're given.

Don't be put of that this has 3 circles... Often these questions are made easier because students over-react to them...
3. (Original post by JLegion)
Draw your Venn diagram. Put in the information you know and then work from there using your knowledge of how Venn diagrams work applied to the information you're given.

Don't be put of that this has 3 circles... Often these questions are made easier because students over-react to them...
I have tried it already, and i still cant do it. The entire paper is so hard. Question 7 is also another one which I cannot do
4. Could you post your working so far so we can see where you're going wrong?

Also, do you remember how to apply information into Venn diagrams? If not, I'd recommend going over that chapter again - practice a few of the review exercise questions too, because they are about as hard as it'll get.

For question 7, what parts are you having trouble with?
5. (Original post by JLegion)
Could you post your working so far so we can see where you're going wrong?

Also, do you remember how to apply information into Venn diagrams? If not, I'd recommend going over that chapter again - practice a few of the review exercise questions too, because they are about as hard as it'll get.

For question 7, what parts are you having trouble with?
for question 7, the first part. The mark scheme shows that you have to multiply the probablities which suggest its independent? but I dont seee why
6. (Original post by imran_)
for question 7, the first part. The mark scheme shows that you have to multiply the probablities which suggest its independent? but I dont seee why
Hmm.. Not sure why the MS states that (I'll look into to it later).

What I thought the solution is is this:

P(M|L) = P(M and L)/P(L) = 0.2/0.3 = 2/3

EDIT: Welp. Looks like I'm wrong (checked the MS)...

EDIT 2: P(M and L) doesn't equal 0.2 as 0.2 refers to the prob of a male being left handed (and not the overall prob of a male being chosen who is left handed). Really struggling to grasp the use of the independence law though...
7. You can tackle this easier with a tree diagram in my honest opinion.

First branch is male (3/5) and female (2/5).

The second branch is left or right. From the male one it will be L (1/5) and R (4/5)

And from the female one is unknown. Maybe call the left branch x. Use your multiplying rules and the information the question tells you (3/10) left handed to find x.
8. (Original post by plaguarist)
You can tackle this easier with a tree diagram in my honest opinion.

First branch is male (3/5) and female (2/5).

The second branch is left or right. From the male one it will be L (1/5) and R (4/5)

And from the female one is unknown. Maybe call the left branch x. Use your multiplying rules and the information the question tells you (3/10) left handed to find x.
would u mind showing a worked solution please

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
your full birthday is required
1. Oops, you need to agree to our Ts&Cs to register

Updated: May 28, 2016
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Today on TSR

### How does exam reform affect you?

From GCSE to A level, it's all changing

Poll
Useful resources

## Make your revision easier

### Maths Forum posting guidelines

Not sure where to post? Read here first

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams

Can you help? Study help unanswered threads

## Groups associated with this forum:

View associated groups
Study resources

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.