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# Edexcel S1 - 15th June, 2016 [Exam Discussion] watch

1. (Original post by timelizard)
yes but the top 20% in terms of a running race is the lowest run times (faster/lower = better)

so yeah, you use the neg value
ah i see, well maybe one mark out of 4 :-(
2. (Original post by timelizard)
so
The probability of booking dinner if youre staying in a room w/ breakfast is
0.27/(0.27+0.33) which is 0.45
the probability of booking dinner if youre staying in a room without breakfast is
0.15/(0.22+0.15) which is 15/37

then you multiply the respective booking numbers by those probabilities, add them together and you get 33

does that make sense?
3. (Original post by Apolexian)
why would you want the lower 20% ih he wants to be in top 20%?
Finishing the marathon in less time = doing better.
So you had to find P(T<t) = 0.2 which came out around 206 minutes I think.

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4. Did anyone get a negative Sdd value and hence a negative r value? (not sure if Sdd or Sww forgot)

And for the first probability question I got 0?
5. (Original post by anna096)
I'm confused by that dinner question
So it told you 100% of people stayed in a room with or without breakfast. It was predicted that 97% would though. So then for eating dinner there, the expected probability was 0.45 (or something like that) so using the same proportion as worked out earlier, surely 46 people order dinner???
Think about it logically. 77 people arrived on a coach to stay at the hotel. How many of those people are not going to stay in a room? 0. The fact that 3% of people at the hotel had dinner but didn't book a room is because some people just went out there to eat.

So you can't just use the proportion for eating dinner. You have to multiply your answers to the last question (P(D|RnB) and P(D|RnB')) by whatever the number of guests with/without dinner were (47 and 30 or something?). I ended up with 33, which I believe is the correct answer.
6. My thoughts on the S1 Paper:

An absolute nightmare! Questions 4 and 5 threw me off.

Anyone else praying for low Grade Boundaries?
7. can we resit this next year?
8. who is got the unofficial paper? please can anyone provide me with a link
9. (Original post by Ppatel0)
Number of diners...
(0.45 x 40) + (15 x 17/15) equals 33
17/15 > 1. How can a probability be > 1?
11. VOTE HERE ON HOW YOU FOUND THE EXAMS. FOR GRADE BOUNDARY PREDICTIONS

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12. (Original post by KINGYusuf)
Did anyone get a negative Sdd value and hence a negative r value? (not sure if Sdd or Sww forgot)

And for the first probability question I got 0?
Yes and yes. Well done
13. well q4 was hard. Otherwise reckon I got 68/69+

boundaries for 100, 90, 80 UMS?

I think
71+ for 100
67+ for 90
56+ for 80
14. (Original post by starkers1997)
My thoughts on the S1 Paper:

An absolute nightmare! Questions 4 and 5 threw me off.

Anyone else praying for low Grade Boundaries?
I thought it was reasonably similar to previous papers apart from the Venn diagram question. Probably the toughest S1 paper, but they keep getting harder and grade boundaries keep getting lower, so...
15. (Original post by hwilkoo)
17/15 > 1. How can a probability be > 1?
I got the same answer (33) but I used the probability 0.405405... or something. I imagine 17/15 was just a typo.
16. (Original post by hwilkoo)
17/15 > 1. How can a probability be > 1?

Omdz I mean the other way round but I can't remember the exact number of people they gave
17. (Original post by zandneger)
Yes and yes. Well done
Thank you, kind sir
18. (Original post by Exams987)
can we resit this next year?
Yes you can
19. VOTE VOTE VOTE

http://www.thestudentroom.co.uk/show...1#post65795491
20. If we got P and Q wrong, is the rest of the question wrong (Error carried forward) or will they give us method marks? This is for the Rebecca and Sara Q

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