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    (Original post by badboy killa)
    I got 0.625,......... i think
    Great I also got 0.625 for P(C), cool.
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    I put:

    4|14|444
    555|15|55
    66|16|6
    777|17|7

    and then key 14:4 means 14

    Is that okay??

    its a bit different.. but the keys right!
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    (Original post by MBR50)
    I put:

    4|14|444
    555|15|55
    66|16|6
    777|17|7

    and then key 14:4 means 14

    Is that okay??

    its a bit different.. but the keys right!
    that looks weird but as long as u put the key it should be ok. if you hadnt the examiner would of thought u done 144, 155, 166 etc. should be fine
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    (Original post by Cool_Tori)
    hey ! What did everyone get forquestion 4 a part ii)?


    I got something like 92.3%?

    Woohoo got this too dudes
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    did you round your exact mean value? i used my 3dp answer and got 93 and a bit %
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    (Original post by rae)
    i got 7/12 for the first, as it was P(2,3) + P(3,2) + P(3,3)
    for the sd of the normal i got 41 2/3 which a few other people on another thread for s1 got also.

    I agree with both of these, thank god, only M2 to do now, gulp!!!
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    (Original post by rae)
    did you round your exact mean value? i used my 3dp answer and got 93 and a bit %
    Yeah I used the exact answer but either way is good.

    16.875/18 = 0.9375

    so 93.75%
    Something like this anyway. Hope you got the same
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    (Original post by mensandan)
    Great I also got 0.625 for P(C), cool.
    I got that... I think i'm the only one who did it by factorisation though! :rolleyes:

    I got somehow:

    0.7=0.2 + P(C) - (P(A)xP(C))
    -0.2

    therefore

    0.5 = P(C) - 0.2*P(C)

    I then relised I could factorise!!!

    therefore

    0.5 = P(C) *(1 - 0.2)

    0.5 = 0.8 P(C)

    therefore P(C) = 0.625

    wow!

    I did that in A aswell... while trying to do A) which coincidently turned out to be piss easy... cos P(A|C) = P(A) = 0.2

    cos they are mutually exclusive! :cool:
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    That is exactly what I did MBR50 this is all very reassuring, great.
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    (Original post by mensandan)
    Yeah I used the exact answer but either way is good.

    16.875/18 = 0.9375

    Something like this anyway. Hope you got the same
    i sure did!

    lucky about only having M2 left. I've got to resit P2 and take S2 also.

    Couldn't get P(C). I got that P(C) - P(AnB) = 0.4 or 0.5, i forget which, but couldn't get any further, and given that's not what was asked, I don't think I'll get many marks for that question!
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    (Original post by chats)
    that looks weird but as long as u put the key it should be ok. if you hadnt the examiner would of thought u done 144, 155, 166 etc. should be fine
    Yeah, but it was weird... i was tryin to enphasise how I'd split it up :-S !!

    I'd never seen one except where you split it up at the 5 mark.

    ie

    1|1123
    1|56788
    2|0012
    2|56

    hopefully if i loose mark(s) ill only loose one though..
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    (Original post by mensandan)
    That is exactly what I did MBR50 this is all very reassuring, great.
    good good!

    but I believe there was a simpler method...

    we must just be ace though! lol..
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    (Original post by mensandan)
    I agree with both of these, thank god, only M2 to do now, gulp!!!
    how many different totals were there for question 1?

    was the dice 1,2,2,3,3,3

    that means
    1,2---1,2---1,3---1,3---1,3
    2,2---2,3---2,3---2,3
    2,3---2,3---2,3
    3,3---3,3

    are those right outcomes or are there more?
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    (Original post by chats)
    how many different totals were there for question 1?

    was the dice 1,2,2,3,3,3

    that means
    1,2---1,2---1,3---1,3---1,3
    2,2---2,3---2,3---2,3
    2,3---2,3---2,3
    3,3---3,3

    are those right outcomes or are there more?
    well you only roll twice and you need a sum of 5 or more which means you only count (2,3), (3,2) and (3,3)
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    I guess there are 36 possible combinations of 2 dice scores

    ... 1 2 2 3 3 3

    1) 2 3 3 4 4 4
    2) 3 4 4 5 5 5
    2) 3 4 4 5 5 5
    3) 4 5 5 6 6 6
    3) 4 5 5 6 6 6
    3) 4 5 5 6 6 6

    of which 21 out of 36 are greater or equal to 5 so 21/36 or 7/12
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    I got 41 and 2/3 for the standard deviation but 0.0465 (or similar) for the normal distribution of under 20 minutes.

    I read that a lot of you got 0.0003 - I'm confused as to how? :confused:

    Please explain
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    I was a bit late there... but my versions still quite clear
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    (Original post by deianra)
    I got 41 and 2/3 for the standard deviation but 0.0465 (or similar) for the normal distribution of under 20 minutes.

    I read that a lot of you got 0.0003 - I'm confused as to how? :confused:

    Please explain
    Yeah I got the same s.d then got 1-0.9406 as my probability (I(-1.56))
    leaving 0.0594
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    yeah, im so confused now.... i got 0.003 tho!
 
 
 
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