Edexcel S2 - 27th June 2016 AM

Reply 840

iMacJack

16

70/75 prediction? A*?

Posted from TSR Mobile

Reply 841

Student403

19

1) 1.41, 1.4419, 0.2510, 0.7769, 0.1378, 0.1516

2) 60, 0.0133, 0.0159, 0.2396

3) 0.5, 151pi/3

4) B = 8, A = -12 (didn't need this), k = 1/9

5) 225 (i got 342.25 too but put 225 as my final answer. Not sure of the correct reason)

6) 9 samples, 0.25(4), 0.3(5), 0.29(6), 0.12(7), 0.04(8) n = 57

7) mean 1.2, var 0.24, prob 0.325, 41.88GBP, no he should not remove staples

(edited 7 years ago)

Reply 842

NamelessPersona

3

Original post by iMacJack

70/75 prediction? A*?

Posted from TSR Mobile

Should be, might be 90 ums exactly considering that 71 was 90 last year

Reply 843

mupsman2312

11

Original post by jonnypdot

can some one please write the function for the last questions please

I THINK that it was something like:

f(x) = (9x-3x^2)/10, for 0<x<2;
0, otherwise.

Reply 844

Piers456

5

Can someone show how to fully work out Q4 A and Q5 please

Reply 845

LearningGeek

4

how many marks do you think id lose if I put n=56 instead of 57, do you think I'd get any??

Reply 846

Ayman!

15

Original post by Student403

1) 1.41, 1.4419, 0.2510, 0.7769, 0.1378, 0.1516

2) 60, 0.0133, 0.0159, 0.2396

3) 0.5, 151pi/3

4) B = 8, A = -12 (didn't need this), k = 1/9

5) 225 (i got 342.25 too but put 225 as my final answer. Not sure of the correct reason)

6) 9 samples, 0.25(4), 0.3(5), 0.29(6), 0.12(7), 0.04(8) n = 57

7) mean 1.2, var 0.24, prob 0.325, 41.88GBP, no he should not remove staples

not bad at all for 2 hours of revision

Reply 847

NamelessPersona

3

Original post by Student403

there was no 90 UMS last year. 92 UMS was 71, 88 UMS was 70.

Scaling is weird sometimes

yeah it is, I just assume that an A* boundary is 90 UMS and you needed 71 for an A*

Reply 848

Student403

19

Original post by NamelessPersona

yeah it is, I just assume that an A* boundary is 90 UMS and you needed 71 for an A*

Actually I deleted my post cause I was wrong lol - 90 UMS was exactly 71. Not sure where I got 92

Reply 849

Student403

19

Original post by Ayman!

not bad at all for 2 hours of revision

I guess not lol

Cheers for the summarised notes! <3

Reply 850

NamelessPersona

3

Original post by Student403

Actually I deleted my post cause I was wrong lol - 90 UMS was exactly 71. Not sure where I got 92

UMS scaling is still weird though

Reply 851

redraccoon

2

Anyone remember how much the finding k part of the question was worth? I got a as 11 which I think was wrong so I got the wrong answer for k... wondering how much I would've lost

Reply 852

jonnypdot

15

Original post by mupsman2312

I THINK that it was something like:

f(x) = (9x-3x^2)/10, for 0<x<2;
0, otherwise.

what was the awnser for var(x) do you find e(x^2)-(e(x))^2

Reply 853

Student403

19

Original post by NamelessPersona

UMS scaling is still weird though

Yeah for sure

Reply 854

imran_

2

What would 56 marks be in UMS?

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Reply 855

mp_x

For the N=225 8 marker I got to the equation then couldn't solve for N so I used trial and error and got 225, would I lose marks? If so how many?

Reply 856

Bob78

1

Urghhhh, for Q5) I got N = 223 because I missed out the continuity correction :frown:

How many marks do you reckon this would lose?! I'm positive I did everything else right, including rejecting the wrong root!

Reply 857

BinaryJava

16

Original post by redraccoon

Anyone remember how much the finding k part of the question was worth? I got a as 11 which I think was wrong so I got the wrong answer for k... wondering how much I would've lost