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

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Reply 1240

iMacJack

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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Reply 1241

iMacJack

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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Reply 1242

timelizard

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

Reply 1243

Piers456

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

Reply 1244

CourtlyCanter

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.

Reply 1245

justalawyer1998

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

(edited 7 years ago)

Reply 1246

tammymxx

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

Reply 1247

Trapz99

I failed it, just like m1

Reply 1248

studentsixth

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.

Reply 1249

Mina_

Is there a poll for how people found todays paper?

Reply 1250

MathsFanatic!

Original post by Mina_

Is there a poll for how people found todays paper?

yep, here http://www.thestudentroom.co.uk/showthread.php?t=4166477. :wink:

Reply 1251

username2130115

ffs arsey needs to come back

Reply 1252

T17MA

My school ran out of papers. Had to photocopy several ones.
Anyone got the paper?

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Reply 1253

zhzstudent

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
the next part was 4

Reply 1254

Kawaii289

Original post by zhzstudent

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
the next part was 4

i got E(R) = 0.45

Reply 1255

timelizard

Original post by Youraveragepleb

So in other words, both remain the same......

i think an examiner would csll that regurgitating a stock answer

Reply 1256

googleit

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 :smile:

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.

(edited 7 years ago)

Reply 1257

Piers456

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)

Reply 1258

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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