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# Arsey's S1 Edexcel Answers 18th Jan 2013

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1. For question 4c), how many marks do you think I would lose as I left my answer as P(L>133) = 0.0139 - I didnt do the P(L>133|L>127) ???
2. (Original post by Steroidsman123)
For question 4c), how many marks do you think I would lose as I left my answer as P(L>133) = 0.0139 - I didnt do the P(L>133|L>127) ???
2.
One for accuracy and one for the final method mark.
3. For q5e, wouldnt it be 1-0.7019 which gives 0.2981, and then 0.7019 - 0.2981 = 0.4038?
4. What do you think the grade boundaries will be? 90%=A*, 80%=A etc? It looks like I've dropped 7 marks, so do you think that will be an A*?
5. (Original post by Kakashidude101)
For q5e, wouldnt it be 1-0.7019 which gives 0.2981, and then 0.7019 - 0.2981 = 0.4038?
Yeah alternatively 2*0.2019. I think he accedentially mixed the 1 and 9 around

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6. I'm extremely gutted I didn't get the Alice phone question right because I divided the P (127 < x < 133) over P (x > 127) so I found the probability it would run out of charge during the five hour journey

other than that it looks ok though, thought it was quite a tough exam for a stats paper
7. I thought it said B OR NOT C how many marks would i lose? And for regression i got my variables wrong so subbed them in wrong etc how many marks would i lose out of 5

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8. Hey guys 63/75 marks what UMS would you reckon that is?
9. (Original post by Rgooderick)
What do you think the grade boundaries will be? 90%=A*, 80%=A etc? It looks like I've dropped 7 marks, so do you think that will be an A*?
I hope 90% is about 66 and 80% is 59

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10. Do you think 63 will definitely be an A?
11. (Original post by president m.e.)
hey guys 63/75 marks what ums would you reckon that is?
a 85 ums
12. (Original post by jayrajani127)
Do you think 63 will definitely be an A?
It's 84% I got exactly the same I reckon it'll probably scrape an A
13. Grade boundaries will be around 57-60 for 80UMS it was not tat much of an easy paper
14. think i got 60/75 hopefully the boundaries go lower if not stay the same (yn)
15. I think it was an easy paper so 63 will be borderline A
16. For the probability tree diagram, i drew a sample space diagram for each die against the coin.. does anyone think i'll get any marks for that?
17. I may not have done as badly as I think I did, haha!

Ironically, I think I did the best on q7 and probability tended to be one of my weakest areas.
18. Thank you so much!
I guess I'm losing around 8-9 marks... hopefully, I'll end up with above 85%..
19. I think i got about 68/75 is that likely to be 90+ ums?
20. (Original post by Polo_0)
For the probability tree diagram, i drew a sample space diagram for each die against the coin.. does anyone think i'll get any marks for that?
I didnt even draw a tree diagram but i think (or hope) that if u get the answer right then it doesnt matter.

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