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# Edexcel s1 June 2016 unofficial mark scheme

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1. Could someone please just remind me how they worked out the answers to part f) in Question 2? I might have got the right answer but I'm not sure, I can remember the method I used but not the exact answers. Cheers
2. Q3(e) What effect will 14mm rain and 70hrs sunshine have on the PMCC?

As the PMCC is -0.753.. this suggests moderate linear negative correlation, i.e. the more rain the less sunshine. As both values (14mm and 70 hrs) are above the mean (10.85mm and 58hrs) this would suggest as one increases so does the other! Therefore this is contrary to the negative correlation and will therefore increase it, bringing it closer to zero.

That's what I thought anyway
3. I got 233 instead of 206 anyone know where i went wrong
4. [QUOTE=civ1;65839343]I got 233 instead of 206 anyone know where i went wrong[/QUOTE

I did this at first too, you worked out the Z value for x<240= 80% and then did 1- the Z value but should just make the z value negative as it isn't a probability. Hope this helps it's quite hard to explain.
5. [QUOTE=SashaWicks;65841315]
(Original post by civ1)
I got 233 instead of 206 anyone know where i went wrong[/QUOTE

I did this at first too, you worked out the Z value for x<240= 80% and then did 1- the Z value but should just make the z value negative as it isn't a probability. Hope this helps it's quite hard to explain.
Hiw many marks could i get if any?
6. [QUOTE=civ1;65841907]
(Original post by SashaWicks)
Hiw many marks could i get if any?
I think you would get 1 out of 3 for working out the Z value maybe?
7. Question paper?
8. do any of you guys know why 'physics and maths tutor' has not put up the model answers for this exam?
9. It's so frustrating that not a single person can post model answers with the paper online. I want to know what I got now, not in 2 months
10. (Original post by speed1✈️✈️)
It's so frustrating that not a single person can post model answers with the paper online. I want to know what I got now, not in 2 months
Why is it though? Like if anything they just get you worked up about your grade until result's day which puts you off your A2 and relaxing over the summer. I think the mark schemes come out in a month anyway (I think)
11. (Original post by studentsixth)
Why is it though? Like if anything they just get you worked up about your grade until result's day which puts you off your A2 and relaxing over the summer. I think the mark schemes come out in a month anyway (I think)
I disagree, last year I knew (for a fact) that I was going get a high A in AS Maths (roughly 88-91ums) by looking at Arsey's mark schemes, and I was bang on correct - I got 266 at AS. I just want to know what mark I got in S1 (how low or high the A is) so that I can know what I need to score in C3/C4 to get an A overall (and I cba for both)
12. (Original post by thesporkthief)
For 6b, I worked out the top 20% as the 20% with the longest times (I'm an idiot) because I misread the question. Do you think I'll lose all three marks or scrape one for doing the right method, just with the wrong values? I need all the marks I can get tbh
I did the same thing and I'm expecting to get 1/3 for it. A similar question about a race was asked as question 4 in June 2011; you could get 3/4 (M1A1M1A0) with a +/- error (the same mistake we made). So I imagine we'll get 1 or even 2 marks.
13. (Original post by speed1✈️✈️)
I disagree, last year I knew (for a fact) that I was going get a high A in AS Maths (roughly 88-91ums) by looking at Arsey's mark schemes, and I was bang on correct - I got 266 at AS. I just want to know what mark I got in S1 (how low or high the A is) so that I can know what I need to score in C3/C4 to get an A overall (and I cba for both)
266 is a great score at AS, why did you re-sit S1 if you don't mind me asking?
14. (Original post by mmdndndndnd)
anyone remember question 6b word for word and can do a worked solution , i got 200 and something but cant remember if it was 203 or 206 !!
i could do it again if i saw the question but i can gaaruntee it was 206.something=206 minutes, this was the one where you got given that he want to be in the top 20% so do PI(z)=0.20, look up 0.20 on the small (z) table which takes values from the positive side which is 0.8416 on a normal distribution cure but then change it to negative as its on the negative side of the symmetry (as we took the values from the table as positive) then do -0.8416=x-(the given mean)/(given standard deviation)
15. (Original post by studentsixth)
266 is a great score at AS, why did you re-sit S1 if you don't mind me asking?
Yeah it is a good score I think. I did M1 at AS😅.
16. (Original post by TSRPAV)
i could do it again if i saw the question but i can gaaruntee it was 206.something=206 minutes, this was the one where you got given that he want to be in the top 20% so do PI(z)=0.20, look up 0.20 on the small (z) table which takes values from the positive side which is 0.8416 on a normal distribution cure but then change it to negative as its on the negative side of the symmetry (as we took the values from the table as positive) then do -0.8416=x-(the given mean)/(given standard deviation)

mean was 240 so s.d was 40 which gives the 206 , i got 206.4 any idea why and should it still be full marks got -0.84 for z value
1.0.994
w=0.721 + 0.0142d
5.691 response was wiggle
2.p=0.175 q=0.15
varx=2.115
E (r) was 0.45 rebecca and sarah winning 0.475 0.375
3. 2.35 -133.9 -0.754
4.0 0.03 0.22 0.45 0.405 33 was number of diners
5. K=0.5
h=17
med=3.47
0.68
0.2546
6. 0.0668
206.336
0.36

Feel free to correct or give answers to non numerical questions
(Original post by KloppOClock)
could you format it a bit better please
(Original post by logicmaryam)
Hey guys
Was told to post my answers on a separate thread so it doesn't get lost in the other thread.

Predicting 58 ish is an A and not much lower because it wasn't that bad of a paper. Loads of people thought it was OK or slightly harder. Theory questions threw me off a bit though.

Q1. 11 total i think
a) was Sdd or something (3)
b) wiggles is the response variable as it changes depending distance (1)
c) r = 0.722 + 0.014d
d) d= 350 sub in so w = 5.6 ish?
Q2 Sarah one
a) equation is 2p + q = 0.5
b) a= 0.175 b= 0.15
c) idk
d) E(R) = 0.45?
e) Sarah wins = 0.475 Rebeccawins= 0.375

Q3 with frequencies?
a) heigh of bar and width igot something like 34cm and 1cm?
b) show that Syy is … (1) didn’tdo this right lol
c) PMCC
d) SD
e) What were the other questions?

Q4 Hotel one
a) 0
b) t =0.03
c) u = 0.22
d) 0.45 and 15/37
e) diners 16? Some people say 33

Q5
a) median 3.47
b) SD = 0.689?
c) mean proof 3.43
d) Probability baby wasunder 3kg something like 0.2546
e) explain the use ofthe model? (2)I said that althoughthe range chosen was appropriate as mean was 3.43 for both and SD was close tothe calculated one, there is negative skew as median>mean so not good to use this model as mean and SD are affected by skew.
f) effect of adding baby weight of 3.43 on (3)
i) mean – I said staysthe same because I sneakily calculated it , because the frequency becomes 51and value is within range or something
ii) SD change "Others said it stayed thesame, but I wrote that it decreases, because now the average distance from themean is slightly less (as n has increased by 1 but deviance hasn't changed)".

Q6.
a) 0.0668 men took over 300 min to run
b) needs to run below 206.33 minutes to be in 20% of people who finish first
c)
d) the mew one0.18/0.5 = 0.36 (3)

Let me know what I'm missing and I've done wrong as well as the marks for each if you remember
(Original post by veldt127)
Ok, I managed to get all my answers stored in my calculator at the end, this is what I got. Not 100% sure on all of them, but we can compare.

Question 1
Spoiler:
Show
a. Show that
b. W - can't remember reasoning
c. 0.994
d. 0.0772 + 0.0142d
e. i. 5.69
ii. Reliable as the data was interpolated; it was within the range
Question 2
Spoiler:
Show
a. 2p + q = 0.5
b. q = 0.15
c. p = 0.175
d. 2.12
e. 0.45
f. i. 0.475
ii. 0.375
Question 3
Spoiler:
Show
a. 2.35
b. Show that
c. -133.9 - possibly -131.9
d. -0.754
e. Increase - I tried using the variables from the new week and recalculating r, and it was higher than the original. I said because the values were both higher than the means; I'm not sure at all on this one.
Question 4
Spoiler:
Show
a. 0
b. t = 0.03
c. u = 0.22
d. i. 0.45
ii. 15/37
e. 33 people have dinner (40*0.18) + (37*(15/37))
Question 5
Spoiler:
Show
a. Width 0.5, Height 17
b. 3.47 (median)
c. i. Show that
ii. Standard deviation = 0.680 - possibly 0.689
d. P(W<3) = 0.2546
e. No - the mean is not equal to the median suggesting asymmetrical skew18% of babies were less than 3kg, but her model predicted 25.46%
f. i. Mean remains the same as the new value is the mean
note: mean might decrease as it adds a value to the 3-3.5 group.
ii. The standard deviation decreases as the variance decreases with a new value close to the mean
Question 6
Spoiler:
Show
a. 0.0668
b. 206 - The lowest 20% of times were the fastest 20% of runners.
c. 0.36
(Original post by KloppOClock)
nice, add some spoilers to each questions.

also, itd be a cool idea if you found out the marks of each question and put a strawpoll asking how many marks you got, that way we could guess grade boundaries a lot easier.
(Original post by Apolexian)
dont agree with 3a
i think it should be w=0.5 from comparing class width
area of given bar =4
A=kF
4=k8 k=0.5
so area of this bar =0.5x17=8.5
h=8.5/0.5=17
(Original post by SANTR)
Just out of interest how did you reach the answer for 2(e). What did you have to do to the given Probability Distribution table?
(Original post by veldt127)
Sorry, why do I need to spoiler answers? If someone's on this thread they'll want to see answers right? I'm new to this so sorry if there's another reason

I found the reciprocal of each score, then multiplied by the probability. Have to say I wasn't sure on that one.
(Original post by KloppOClock)
so it doesnt take up half the screen, its just nicer formattin
(Original post by Florent venhari)
I got these wrong:
2 f ii)
3 e) maybe I got one mark
4 d i)
4 e)
5 e) lost 1-2 marks
5 f ii)
6 c) maybe I got one mark for getting 0.5 as one of the probabilities.

Oh wells

Posted from TSR Mobile
http://www.thestudentroom.co.uk/show...5#post65854175
18. YESSS! thank you so much turns out I lost 10 marks so 65 whoop whoop
19. (Original post by logicmaryam)
YESSS! thank you so much turns out I lost 10 marks so 65 whoop whoop
Should be at least 90ums, I thought this paper was tricky

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