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STEP I 2010 Discussion Thread

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Reply 80

ny2ko

I fear tmrws STEP II will b crazily hard to balance it out :frown:

Reply 81

username219321

Killer_bees

Could anyone guess a mark for my attempt?

Q1 got two solutions for x,y but forgot to go back and get the other two.

Q2 was fine apart from the second graph where I missed off the stationary points (don't know how I managed that)

Q3 Got the first 3 'show thats'

Q4 instead of 2pi ln5/4 I got 2pi ln 5

Q6 was perfect

Q8 explained why a must be divisible by 3 but stopped there

What do you think?

mid 70s maybe? (around 15, 15, 10, 15, 20, 2 - probably harsh)

Reply 82

miml

I think grade boundaries will be pretty much identical to last year (with possibly a very slightly higher boundary for a 1 and 2)

:crossedf:

for an S

Reply 83

markioe

Someone answer my questions on bottom of page 4!!!!
Im stressing!

Reply 84

miml

markioe

Someone answer my questions on bottom of page 4!!!!
Im stressing!

I can't say for 1,2,3 (I didn't do the last 2, and am not sure myself about the first)
4 - probably drop 2/3 marks for not getting it in the required form (I've put a solution on the first page)
5 - 3 marks for part i I'd guess
6 - 17-20 depending on if there were any arithmetic slips.

Reply 85

markioe

miml

ARGH i just checked ur solution to question 4, oh well, yeah hopefully they will only take a few marks off...

I hope i get my grade 2 anyway...

Thanks for uploading the paper btw

Reply 86

username219321

jammiebreadman

Does anyone know if getting Q1,4,6 out (I think) perfectly and then doing the expressions at the beginning of question 3 enough to get me my level 2 for Warwick?

More than likely yes unless the grade boundaries are really high like last year

Reply 87

markioe

Is there any definite solution yet for question 3? Seems like a few of us used the same method (tanx=tany therefore x= y +npi)

Reply 88

username219321

ny2ko

we allowed to do that?? I had no idea but really no way i'd take the paper home. would have night mares looking through it and seeing my errors!

I spent so long last night checking my answers using wolfram and autograph and calculating the best and worst case scenarios for what marks I could've got :o:

Reply 89

Small123

Would 70-80 suffice for a grade 1? (really happy if it does, I'm only in Year 11 and didn't revise at all aha)

Reply 90

username219321

markioe

Is there any definite solution yet for question 3? Seems like a few of us used the same method (tanx=tany therefore x= y +npi)

I just did it using cot, I assume everyone else had the cot thing then took the reciprocal?

Once I had r + s - p - q = 2npi I did: (there was probably some quicker way than this haha but any valid proof gets the marks :wink:

)

r < 2pi and s < 2pi so r + s < 4pi
and p > 0 and q > 0 so p + q > 0
so -p - q < 0
so r + s - p - q < 4pi so n => 2 is impossible

also, r > q so r - q > 0
and s > p so s- p > 0
so r + s - q - p > 0 so n =< 0 is impossible

this means n= 1 therefore r + s - p - q = 2pi

Reply 91

username219321

Small123

Would 70-80 suffice for a grade 1? (really happy if it does, I'm only in Year 11 and didn't revise at all aha)

Almost definitely a 1

Reply 92

miml

Small123

Would 70-80 suffice for a grade 1? (really happy if it does, I'm only in Year 11 and didn't revise at all aha)

Easily...

(Well last year the 1 boundary was 71, so maybe just about if it is in the lower end of the 70-80 range)

Reply 93

Killer_bees

matt2k8

mid 70s maybe? (around 15, 15, 10, 15, 20, 2 - probably harsh)

Thanks for that, for question 3 I just meant the three trig identities did you mean 10 marks for just those?

Reply 94

jammiebreadman

matt2k8

More than likely yes unless the grade boundaries are really high like last year

What were the grade boundaries last year?

Reply 95

username219321

jammiebreadman

What were the grade boundaries last year?

S: 95, 1: 71, 2:61, 3: 49 I think

Reply 96

Goldfishy

jammiebreadman

What were the grade boundaries last year?

Link (scroll to the bottom). Last year a 1 was 72 marks, so 70-80 should be a 1.

Reply 97

Goldfishy

matt2k8

S: 95, 1: 71, 2:61, 3: 49 I think

S: 95, 1: 72, 2: 58, 3: 35 for ''09 STEP I

Reply 98

The Bigtime

Right, here's my thoughts.
Q1, Didn't look too bad, but I left it to near the end and only managed the first factorisation.
Q2, Did the whole question. Was happy with my curves, would be interested if someone posted there curves to see if they were similar to mine. I reckon 15-20 marks.
Q3, I got to the stage where I had r+s-p-q=n(pi), but didn't have much justification of why n=2
Q4, Despite having to search a while for my error, I got the required solution. 20 marks.
Didn't attempt Q5, but I've just done it now and thought it was easy. Gutted I didn't try it in the exam.
Q6, I got y=Ax+Be^x+C, which is wrong, but close. I think I just said put C=0, to get the required result :s-smilie:

Saw Q7 was vectors and immediately discarded it.
Q8, did part (i) and then started (ii) but messed it up then gave up.

What do you guys reckon? With highish grade boundaries I reckon I'm on the 2/3 borderline :frown:

Reply 99

jammiebreadman

Goldfishy

Link (scroll to the bottom). Last year a 1 was 72 marks, so 70-80 should be a 1.