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Arsey's Edexcel S1 S14 (UK R + IAL ) Model Answers

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Reply 40

ac1

Will you put the fp1 mark scheme up?

Reply 41

MathsEconomics17

Hey Arsey, a few questions if you wouldn't mind asking..

3f) I just subbed in 2,500,000 into the -467.2+0.74v - how many marks will I lose?
6b) I used 30 and 55 rather than 29 and 54, which my teacher said was right as it's not the 29th value.. I used the correct method and got 75.2? Will I lose just one mark?
This obviously altered d but got me the same summary so will I lose just one mark there too?
7c) I used the correct method entirely, but I didn't use 0.0528 i used 0.05 from my percentage points and ended up getting 173.something.. Really annoyed I lost marks from that, but I was thinking 2 loss? What do you think?

Thanks,
Matt

Reply 42

Darkwarrior23

69/75!

Won't make up for C2 though :angry:

Reply 43

Lennie4Life

Are these answers definitely correct? 172.96 seems a bit too small for h (7c)

Reply 44

5awkins

Original post by tabmax22

Hi Arsey, for question 7C the one about normal distribution (finding h), I foolishly forgot to standardise h and simply wrote that h = 1.62. How many marks would I lose out of 5?

Probably get 3. M1 lost for not standardising. And A1 lost for the answer

Reply 45

Equal

If on the box plot you draw 3 whiskers, one for the lowest value , one for highest value and one for upper outlier boundary, do you lose any marks?

Reply 46

Swadq

I notice that for the first question, you initially got Q3 wrong, but then went back to change it. This affected your skewness answer, which you also changed. I did the same thing as you, but neglected to change my answer to the skewness question.

I effectively wrote:

Greenslax - Negatively correlated, as:
Q2 - Q1 > Q3 - Q2
24 > 12

Do you think I'd lose anything for that?

Reply 47

Dalek1099

I think it should be 61 for an A again the first few were easier than normal with the calculations nicely split up for you with you getting a seperate question for E(X) and E(X^2) and a question on just calculating B but the probability and normal distribution were harder than usual but not unlike past papers.How many marks will I lose on parts c and d for doing subtraction wrong and get 1.6P(B)=0.22 and thus P(B)=0.1375 can't remember all my answers but that looks to be my only mistake but they still worked out as independent when I did it.

Reply 48

hilaryleeson

so annoying i thought the biscuit thing was given that it was k, only thing i got wrong i think, would that lose all 3?

Reply 49

melridout123

Could you please do this for fp1?

Reply 50

bobo19966

Is there something like error carrying as I calculate wrong on question 7a but correct method on question 7c??

Reply 51

Darkwarrior23

Original post by Lennie4Life

Are these answers definitely correct? 172.96 seems a bit too small for h (7c)

Nope, its the right answer! If you look at part 2 hardly any of the women are over 180 (close to 0)

Reply 52

stripeyghost

Mis-read 6a and thought they gave the 0-30 not 30-60... so annoying. Same width though so maximum of 2 marks lost there. Looks like i got everything else though

Reply 53

Mutleybm1996

Original post by Darkwarrior23

Nope, its the right answer! If you look at part 2 hardly any of the women are over 180 (close to 0)

Would i be penalised for writing 173?

Posted from TSR Mobile

Reply 54

Darkwarrior23

Original post by Mutleybm1996

Would i be penalised for writing 173?

Posted from TSR Mobile

I don't think so... it would be best if you found 172.96 then rounded answer to 173 as final answer...so examiner can see you rounded.

Reply 55

Whatdidyougetfor

Arsey for the last question, If i were to put 'Given that P(A|B) = 0.6 and P(A) = 0.6 , they are statistically independent' would it be enough to gain the full 2 marks?