You are Here: Home >< Maths

# S2 Jan 2007 Q5 Edexcel Watch

1. Can someone please explain to me part C onward? The mark scheme is no use and I don't understand how the variable X applies to this situation
2. (Original post by Jordan97)
Can someone please explain to me part C onward? The mark scheme is no use and I don't understand how the variable X applies to this situation
3. (Original post by Zacken)
Sorry, question 5 on this paper: http://qualifications.pearson.com/co...2007_Paper.pdf
4. (Original post by Jordan97)
Sorry, question 5 on this paper: http://qualifications.pearson.com/co...2007_Paper.pdf
Well, the question says that "the length in cm of the piece of wire with the ring on it is represented by the random variable X".

So since X is uniformly distributed on (0, 150), the mean of X is...?
5. (Original post by Zacken)
Well, the question says that "the length in cm of the piece of wire with the ring on it is represented by the random variable X".

So since X is uniformly distributed on (0, 150), the mean of X is...?
That's what I don't understand though, why is X uniformly distributed on (0, 150) when the values of a and b are -2 and 6
6. (Original post by Jordan97)
That's what I don't understand though, why is X uniformly distributed on (0, 150) when the values of a and b are -2 and 6
No, this part of the question has nothing to do with the previous part of the question. This is a new X. Defined in the paragraph above (c).
7. (Original post by Zacken)
No, this part of the question has nothing to do with the previous part of the question. This is a new X. Defined in the paragraph above (c).
Ah okay, I think that is quite misleading though, why didn't they use Y or some other letter or explicitly say a different variable??
8. (Original post by Jordan97)
Ah okay, I think that is quite misleading though, why didn't they use Y or some other letter or explicitly say a different variable??
Well, to be fair, they did re-define it.
9. (Original post by Zacken)
Well, to be fair, they did re-define it.
True, thank you for your help though!
10. (Original post by Jordan97)
True, thank you for your help though!

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:
Updated: June 13, 2016
Today on TSR

### Does race play a role in Oxbridge admissions?

Or does it play no part?

### The worst opinion about food you'll ever hear

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

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

• Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

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

• 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.