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Edexcel (IAL) S1 June 15th 2016 Discussion watch

  • View Poll Results: How was the IAL S1 Exam (THIS IS IAL NOT GCE)
    Easy as pie.
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    Was very good.
    11
    37.93%
    Ok.
    8
    27.59%
    It was hard.
    7
    24.14%
    Failed.
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    (Original post by MichealD)
    i believe that your answer to q3 where they ask you for the p(t=3)=1/2 is incorrect , since the p of 3 alone is 1/2 and you can also obtain a total of three from (1,2) + (2,1) + (0,3)
    noo i didnt solve it like that

    p(t=3) = (4/16)/1/2= 1/2
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    my answer was 23/36 , what i did is the following
    to obtain a total score of 3 or a three you have to add
    p(3)+p(0,3)+p(1,2)+p(2,1)
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    (Original post by MichealD)
    i believe that your answer to q3 where they ask you for the p(t=3)=1/2 is incorrect , since the p of 3 alone is 1/2 and you can also obtain a total of three from (1,2) + (2,1) + (0,3)
    Ayyyyy, I was really confused by what their answer.
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    (Original post by MichealD)
    my answer was 23/36 , what i did is the following
    to obtain a total score of 3 or a three you have to add
    p(3)+p(0,3)+p(1,2)+p(2,1)
    I did the same
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    did you obtain the same answer ? and what was your answer for the given question?
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    (Original post by MichealD)
    did you obtain the same answer ? and what was your answer for the given question?
    I got the same asnwer too. Which given question?
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    the one under this question where they say what is the p(3 given rolled twice)
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    (Original post by MichealD)
    i believe that your answer to q3 where they ask you for the p(t=3)=1/2 is incorrect , since the p of 3 alone is 1/2 and you can also obtain a total of three from (1,2) + (2,1) + (0,3)
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    (Original post by wenogk)
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    thats exactly what i did , what about the question below it , where they asked for the p(3 given rolled twice) i obtained 5/18
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    (Original post by MichealD)
    did you obtain the same answer ? and what was your answer for the given question?
    (Original post by Sunethra)
    I got the same asnwer too. Which given question?
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    (Original post by wenogk)
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    Yes i did it like that except for part 3 i beleive it was my mistake
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    There was a question 2 i believe there was a coding where v=(t-5)/10

    in the last part he asked for the estimation for mean and standard deviation
    i made t the subject correct me if i am wrong
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    (Original post by Tigernoob)
    There was a question 2 i believe there was a coding where v=(t-5)/10

    in the last part he asked for the estimation for mean and standard deviation
    i made t the subject correct me if i am wrong
    For the mean yeah just make t the subject but for standard deviation only multiply by 10
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    (Original post by Tigernoob)
    There was a question 2 i believe there was a coding where v=(t-5)/10

    in the last part he asked for the estimation for mean and standard deviation
    i made t the subject correct me if i am wrong
    For mean this is correct but for sd just multiply v by 10 because adding something in coding doesnt affect sd
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    (Original post by Tigernoob)
    Yes i did it like that except for part 3 i beleive it was my mistake
    Lol my wholw question is wrong
    So lost 8 here and 5 in venn diagram
    ****
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    (Original post by wenogk)
    For the mean yeah just make t the subject but for standard deviation only multiply by 10
    what i did is i made t the subject so its like 10v+5 is = t

    then said E(t)=10XE(v)+5

    for standard deviation i did
    Var(t)= 10^2 x Var(v)

    i converted the s.d i got on the upper part to the variant and mulitplied with the 10^2

    i hope what i did correct xD
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    (Original post by ToxicPhantom007)
    Lol my wholw question is wrong
    So lost 8 here and 5 in venn diagram
    ****
    part 3 wasn't for 8 marks ?
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    What was the skewness?
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    Ahhh... Finally exams over for me.Paper was easy.I did lose marks in q2.but I'll get atleast 1 mark in that.
    And for r and q both were positive right? I don't remember my probability questions :P and you were supposed to the 'show that B=3/8' using simultaneous eq.s
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    (Original post by Tigernoob)
    what i did is i made t the subject so its like 10v+5 is = t

    then said E(t)=10XE(v)+5

    for standard deviation i did
    Var(t)= 10^2 x Var(v)

    i converted the s.d i got on the upper part to the variant and mulitplied with the 10^2

    i hope what i did correct xD
    I don't understand, how did you get Variance wasn't it just standard deviation
 
 
 
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