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# S2 Jan 2007 Q5 Edexcel

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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!
No worries, glad it's sorted!

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