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

iMacJack
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#1241
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#1241
(Original post by asinghj)
Just out of interest, did anyone get 0 for any question in the UK S1?
Yes - probability of breakfast and not booking (part a


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iMacJack
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#1242
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#1242
(Original post by Student7th)
Does any one know how many marks the questions were out of?
In particular the Sarah and Rachel one
7 marks I believe


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timelizard
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#1243
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(Original post by Themathgeek)
No way!

Definitely 75 for 100ums! Or in the very extreme circumstance it may possibly be 74.

No way in hell will it be as low as 71- sorry to break the truth....


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agreed; i would have thought 73/74
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Piers456
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#1244
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(Original post by Student7th)
Does any one know how many marks the questions were out of?
In particular the Sarah and Rachel one
E (R) was 3 marks
Sarah winning
Rebecca winning
Was 4 marks
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CourtlyCanter
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#1245
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(Original post by themechguy)
I said the mean remains the same, but standard deviation is unchanged!

I didnt put any explanation dosn, do they need explanation for the marks? The question didnt say explain..
They did say provide a reason for your answer so yes the explanation itself would warrant a mark.
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justalawyer1998
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#1246
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(Original post by timelizard)
agreed; i would have thought 73/74
Yeah, 74ish for full, probs 68 for 90

People always overreact right after an exam, so it's not a reliable indication of grade boundaries
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tammymxx
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#1247
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#1247
(Original post by Piers456)
E (R) was 3 marks
Sarah winning
Rebecca winning
Was 4 marks
How did u work out rhe answers for the 4 mark
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DetectivePeralta
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#1248
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#1248
I failed it, just like m1
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studentsixth
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#1249
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#1249
(Original post by Nikhilm)
Yeah, 74ish for full, probs 68 for 90

People always overreact right after an exam, so it's not a reliable indication of grade boundaries
66 for 90 tbh. Grade boundaries have been quite low for the past few years. So 68 for 90 would be too high.
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Mina_
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#1250
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#1250
Is there a poll for how people found todays paper?
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MathsFanatic!
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#1251
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(Original post by Mina_)
Is there a poll for how people found todays paper?
yep, here http://www.thestudentroom.co.uk/show....php?t=4166477.
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username2130115
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#1252
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#1252
ffs arsey needs to come back
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T17MA
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#1253
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#1253
My school ran out of papers. Had to photocopy several ones.
Anyone got the paper?

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zhzstudent
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#1254
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#1254
[QUOTE=Student7th;65802383]Does any one know how many marks the questions were out of?
In particular the Sarah and Rachel one[/QUOTEE]

E(R) was 3
the next part was 4
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Kawaii289
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#1255
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#1255
[QUOTE=zhzstudent;65802693]
(Original post by Student7th)
Does any one know how many marks the questions were out of?
In particular the Sarah and Rachel one[/QUOTEE]

E(R) was 3
the next part was 4
i got E(R) = 0.45
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googleit
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#1256
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#1256
(Original post by Raaj11)
Yeah i figured out my mistake. The data would be less varied now so standard deviation would decrease.
I lost two marks for this question i guess?
The mean DECREASED guys, not stayed the same, we're dealing with classes here. The value of 3.43 will add one to the frequency of the 3-3.5 class. The way we work out the estimate is to multiply the midpoint of the class by the frequency. Hence, since the midpoint of this class is 3.25, which is lower than the mean, the mean decreases.
You could have also done the actual calculation to check, the mean decreased

EDIT: I'll explain this better. The mean before the added values was 3.43. Now there's an added value of 3.43. This adds one to the frequency of 3-3.5 class. In working out the value of the mean, you have to multiply mid point by frequency. Hence, you don't actually deal with 3.43 but rather 3.25, the mid point of the class. Since this value is less than 3.43 the mean decreases.
Try the calculation out for yourself and please amend the unofficial mark schemes.
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timelizard
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#1257
(Original post by Youraveragepleb)
So in other words, both remain the same......
i think an examiner would csll that regurgitating a stock answer
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Piers456
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#1258
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#1258
(Original post by tammymxx)
How did u work out rhe answers for the 4 mark
They tell you S = X and R = 1/X
You want the probability that Sarah beats Rebecca so you do P (S>R)
This works out to be P (X > 1/X) = P (X>1/2)
You would then look in the table at the start of the question for all values greater than 1/2, same for Rebecca winning
P (R>S)P (X <1/2)
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Pikki1234
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#1259
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#1259
Hey guys, how many marks was the question about being in the top 20%.
I accidentally used 60 as the value for standard deviation but I got the method right, so how many marks would I lose for that?


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bobbutitii
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#1260
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#1260
(Original post by Pikki1234)
Hey guys, how many marks was the question about being in the top 20%.
I accidentally used 60 as the value for standard deviation but I got the method right, so how many marks would I lose for that?


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