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# S1 Edexcel June 2008 help please!! watch

1. Hi,
I've been practicing this paper and I don't understand how to answer question 6a . The mark scheme answers it by using f(4)=1 but i don't understand why

Can anyone help please?

The question paper

Mark Scheme

Thank You!
2. Because it's cumulative, the last box has to equal 1. 25/25=1 so (4+k)^2 must equal 25
3. (Original post by Xara202)
...
Since X can only take values for x=2,3,4. Then P(X<=4) = 1, but P(X<=4)= F(4), hence....
4. (Original post by Naomiimoan)
Because it's cumulative, the last box has to equal 1. 25/25=1 so (4+k)^2 must equal 25
Ah, I remember learning that but I completely forgot lol
Thank You
5. (Original post by Xara202)
Ah, I remember learning that but I completely forgot lol
Thank You
No probs
6. what the ef is a explanatory variable?
7. for 7c why do u times it by 3?
8. (Original post by Xara202)
Hi,
I've been practicing this paper and I don't understand how to answer question 6a . The mark scheme answers it by using f(4)=1 but i don't understand why

Can anyone help please?

The question paper

Mark Scheme

Thank You!

can u help me answer q6 b? how do i do it?

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