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    (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
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    (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
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    (Original post by 4nonymous)
    He's asking how much the last question AND the question you just mentioned are worth. Not just that one
    my bad, i misread it. thanks for pointing it out, added an edit
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    (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
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    Unofficial markscheme with marks?

    Posted from TSR Mobile
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    (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?
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    (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.
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    (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
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    (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
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    (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
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    (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.
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    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
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    (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
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    69 for C1
    67 for c2
    52 for S1

    sign, there goes my a* for maths
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    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

    Thanks in advance
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    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!
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    (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

    Thanks in advance
    You may get 1 or two, but you needed some reasoning behind it
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    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
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    (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
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    (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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