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

1. (Original post by uk_shahj)
That wasn't the very last question, it was question 5 I think. It was worth 3 marks, the one where you explain if Shyan was justified in using a normal distribution.
He's asking how much the last question AND the question you just mentioned are worth. Not just that one
2. (Original post by QuantumStuff)
Do we have an unofficial markscheme yet?
Question 1
Spoiler:
Show
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
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
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
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
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
Spoiler: show a. 0.0668
b. 206 - The lowest 20% of times were the fastest 20% of runners.
c. 0.36
3. (Original post by 4nonymous)
He's asking how much the last question AND the question you just mentioned are worth. Not just that one
4. (Original post by Dark knight123)
basically guys for the diner question i got 17 people, is this correct and if not what was it and why?
cheers
(Original post by JustOneLastTime)
I got 17 aswell but I'm not sure if its right
Was that the probability question with the hotel and stuff.
I got 33 because I did:
P(DIBnR)*number of people + P(DIB'nR)*number of people
9/20*40 + 15/37*37 = 18+15 = 33
5. Unofficial markscheme with marks?

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6. (Original post by NoahMal)
Question 1
Spoiler:
Show
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
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
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
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
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
Spoiler: show a. 0.0668
b. 206 - The lowest 20% of times were the fastest 20% of runners.
c. 0.36
Thank you. Think I did fairly well. Probably dropped about 10 marks max.
Do you know how many marks 90 UMS was last year?
7. (Original post by 4nonymous)
Was that the probability question with the hotel and stuff.
I got 33 because I did:
P(DIBnR)*number of people + P(DIB'nR)*number of people
9/20*40 + 15/37*37 = 18+15 = 33
oh **** i worked those two out in the previous question, pissed of now.
8. (Original post by 4nonymous)
Thank you. Think I did fairly well. Probably dropped about 10 marks max.
Do you know how many marks 90 UMS was last year?
shot in the dark: 68
9. (Original post by 4nonymous)
Thank you. Think I did fairly well. Probably dropped about 10 marks max.
Do you know how many marks 90 UMS was last year?
66 for 90 UMS so probably about the same this year or maybe even 65
10. (Original post by Dark knight123)
oh **** i worked those two out in the previous question, pissed of now.
Yh you had to use the previous question. I remember doing a very similar question the night before so I knew I was doing it right
11. (Original post by NoahMal)
shot in the dark: 68
(Original post by studentsixth)
66 for 90 UMS so probably about the same this year or maybe even 65
Thank you.
12. I think I got 62 marks, what grade do you think it is? I flopped badly in this exam, because I missed a question accidentally

Posted from TSR Mobile
13. (Original post by DaVinciGirl)
I think I got 62 marks, what grade do you think it is? I flopped badly in this exam, because I missed a question accidentally

Posted from TSR Mobile
An A
14. 69 for C1
67 for c2
52 for S1

sign, there goes my a* for maths
15. On that question when you have to say how the new data piece will effect the mean and Standard Deviation, will i get marks for just putting;

The mean will stay the same

The standard deviation will decreases

16. 71/75. Any UMS predictions for me? Zacken or anyone!

(PS: What would 73/75 on C1, 75/75 on C2, and 71/75 on S1 roughly be as an overall UMS?)

Thanks, and best of luck I hope you all achieve the grades you want!
17. (Original post by leestitt)
On that question when you have to say how the new data piece will effect the mean and Standard Deviation, will i get marks for just putting;

The mean will stay the same

The standard deviation will decreases

You may get 1 or two, but you needed some reasoning behind it
18. how do you do the very last venn diagram question? it asked how many had dinner so i just did 77 * the probability of the dinner section and ended up getting decimal numbers
19. (Original post by iMacJack)
71/75. Any UMS predictions for me? Zacken or anyone!

(PS: What would 73/75 on C1, 75/75 on C2, and 71/75 on S1 roughly be as an overall UMS?)

Thanks, and best of luck I hope you all achieve the grades you want!
Your probably looking almost at the full 300 UMS Marks Mate,

C1 - 98

C2 - 100

S1 - 97/98

Worst case scenario, 295 UMS
20. (Original post by leestitt)
Your probably looking almost at the full 300 UMS Marks Mate,

C1 - 98

C2 - 100

S1 - 97/98

Worst case scenario, 295 UMS
Cheers! However this is obviously assuming I got all method marks... I'm confident with the 100 UMS in C2, and the high 90's in C1, maybe 93-95 in S1 potentially?

We'll see! Nonetheless it's a good amount of UMS so I'm happy! How are your results looking?

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