Hey there! Sign in to join this conversationNew here? Join for free
    Offline

    0
    ReputationRep:
    (Original post by jit987)
    Is that for Uniform distribution questions, like in some interval (0,20) then work out P(4<x<5). Or are you talking about poisson/binomial/cdf/pdf?
    For a PDF question if the questions says P(x=5) is it always 0 or is that only for CDF?
    trouble with all of the above- binomial/normal/poisson etc. i can never figure out what to subtract from what n which values to look for in the tables...i get especially confused between what to do for P(4<=X<5) or P(4<X<=5)...wat do i do in each case? i really need an A*...any help would be appreciated sincerely..
    Offline

    0
    ReputationRep:
    (Original post by jit987)
    Not started yet, but will start papers soon..
    Rep for you

    You don't happen to have any C3 papers from 2010 do you?
    Offline

    0
    ReputationRep:
    (Original post by Oxmatt)
    Rep for you

    You don't happen to have any C3 papers from 2010 do you?
    i do...
    Offline

    3
    ReputationRep:
    (Original post by Oxmatt)
    Rep for you

    You don't happen to have any C3 papers from 2010 do you?
    Jan + June?
    Offline

    3
    ReputationRep:
    (Original post by Geniusmiss)
    trouble with all of the above- binomial/normal/poisson etc. i can never figure out what to subtract from what n which values to look for in the tables...i get especially confused between what to do for P(4<=X<5) or P(4<X<=5)...wat do i do in each case? i really need an A*...any help would be appreciated sincerely..
    1- This is straight forward because you want less then 5 but it has to be more or equal to 4 so its just P(X=4)
    2 - This one includes 5 but not 4, so just P(X=5)
    In instances when is P(4<= X <=10) convert that into P(X<=10) - P(X<=3). (The second number is always less than 1).

    But if the question says P(4<X<9), convert that into P(5<=X<=8) and then do same as above.
    Offline

    0
    ReputationRep:
    (Original post by jit987)
    1- This is straight forward because you want less then 5 but it has to be more or equal to 4 so its just P(X=4)
    2 - This one includes 5 but not 4, so just P(X=5)
    In instances when is P(4<= X <=10) convert that into P(X<=10) - P(X<=3). (The second number is always less than 1).

    But if the question says P(4<X<9), convert that into P(5<=X<=8) and then do same as above.
    thank you very much!
    Offline

    0
    ReputationRep:
    did anyone get the june 2010 question 3? i did manage to get the right answer...but i dont get the logic...neither does my really stupid teacher! i have attached the screenshot of the question and the mark scheme
    Attached Images
      
    Offline

    0
    ReputationRep:
    (Original post by jit987)
    Jan + June?
    That's the ticket!
    Offline

    0
    ReputationRep:
    (Original post by cazzy-joe)
    It is P(x&gt;17) not P(x \geq 17)

    If it would have been P(x \geq 17), then it would be P(x \geq 16.5)

    If I'm wrong please correct me
    Thats it. I was having a random mental block. cheers
    Offline

    17
    ReputationRep:
    (Original post by Geniusmiss)
    did anyone get the june 2010 question 3? i did manage to get the right answer...but i dont get the logic...neither does my really stupid teacher! i have attached the screenshot of the question and the mark scheme
    This was the S2 paper I did

    It's a rectangle with perimeter 20cm. X is one side, let Y be the other side. So X+Y = 10 (since 2X+2Y = 20)

    The probability that the length of the longer side is more than 6cm has two possible cases.

    Firstly if

    6&lt;X&lt;7

    Or if

    6&lt;Y&lt;9 \Longrightarrow 1&lt;X&lt;4

    So the only time one side won't be greater than 6cm is when

    4&lt;X&lt;6

    Which has a probability of (6-4)/(7-1) = 1/3

    So the probability one side is >6cm is 1-1/3 = 2/3
    Offline

    0
    ReputationRep:
    (Original post by Noble.)
    This was the S2 paper I did

    It's a rectangle with perimeter 20cm. X is one side, let Y be the other side. So X+Y = 10 (since 2X+2Y = 20)

    The probability that the length of the longer side is more than 6cm has two possible cases.

    Firstly if

    6&lt;X&lt;7

    Or if

    6&lt;Y&lt;9 \Longrightarrow 1&lt;X&lt;4

    So the only time one side won't be greater than 6cm is when

    4&lt;X&lt;6

    Which has a probability of (6-4)/(7-1) = 1/3

    So the probability one side is >6cm is 1-1/3 = 2/3
    thanks a lot...u sound really smart...if u dont mind me asking...wat grade did u get? and which uni's are thinking of appyling to?
    Offline

    17
    ReputationRep:
    (Original post by Geniusmiss)
    thanks a lot...u sound really smart...if u dont mind me asking...wat grade did u get? and which uni's are thinking of appyling to?
    I got A*A*A*Aa in maths, further maths, chemistry, physics and biology respectively last year. I'm going to Oxford to do maths in October

    I got 95 in S2
    Offline

    0
    ReputationRep:
    here's me with another question...sorry for asking so many but i really need that A*...do these type of questions even come up? its from the edexcel textbook...i dont get it at all...i have posted the answer and the question...i mite sound silly for not knowing this but gimmme a break im doing 5 a level papers! n im in year 11!
    Attached Images
      
    Offline

    0
    ReputationRep:
    I know this is about S2...but does anyone know where I can get S1 past papers Solomon ones from? Thanks
    Offline

    0
    ReputationRep:
    (Original post by Noble.)
    I got A*A*A*Aa in maths, further maths, chemistry, physics and biology respectively last year. I'm going to Oxford to do maths in October

    I got 95 in S2
    woah! i wanna go to oxford too...for business and economics...i hope my qualifications will be enough to get in!
    Offline

    0
    ReputationRep:
    (Original post by t_star)
    I know this is about S2...but does anyone know where I can get S1 past papers Solomon ones from? Thanks
    http://www.freeexampapers.com/past_p...FS1%2FSolomon/
    Offline

    0
    ReputationRep:
    thanks for the link!

    For some reason the files arent loading :/ when i click on any of them it just keeps loading?

    It workss now! THank you SO much! Going to help me out so much for tomorrow
    Offline

    0
    ReputationRep:
    (Original post by t_star)
    thanks for the link!

    For some reason the files arent loading :/ when i click on any of them it just keeps loading?
    the server must be down...it'll take a bit..try this link- http://www.xtremepapers.net/Edexcel/...ed/S1/Solomon/
    Offline

    0
    ReputationRep:
    (Original post by Noble.)
    I got A*A*A*Aa in maths, further maths, chemistry, physics and biology respectively last year. I'm going to Oxford to do maths in October

    I got 95 in S2
    how did u prepare for C3 & C4? im doing c4,c3,s2 at once...
    Offline

    0
    ReputationRep:
    (Original post by Geniusmiss)
    the server must be down...it'll take a bit..try this link- http://www.xtremepapers.net/Edexcel/...ed/S1/Solomon/
    Thank youu This one workss!
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Did TEF Bronze Award affect your UCAS choices?
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Quick reply
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.