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OCR MEI Statistics 1 (S1)

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The Grow your Grades contest is here, join in to help each other achieve your study goals 22-01-2015
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    (Original post by nicknickmac)
    for the probability of the third person using that browser? yep i did too :-)

    for the next question about 2nd or 3rd person did anyone do (.92 x .92 x .8) + (.92 x .8)?
    Yes I did that
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    (Original post by EmmaJane_)
    Left revision far too late and couldn't answer half of the questions.
    Facepalm.
    Same here 'poker face :/

    This was posted from The Student Room's Android App on my GT-I9100
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    (Original post by George_)
    Yeah I did that!

    And for the mean and SD question I got 1890.625 = mean, 890 something = sd.
    I got the same mean as youuu but my sd was like 849.. did you remember to divide by n-1? rather than just n?
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    any ideas on grade boundaries ???
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    did people put for one of the question i think it may have been the broswer one where there were 20... did u guys do 1- (p that none had used the browser) which was 1 - 0.92*20
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    I failed that paper. I really hope its a low grade boundary

    This was posted from The Student Room's Android App on my GT-I9100
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    (Original post by sreddy17)
    did people put for one of the question i think it may have been the broswer one where there were 20... did u guys do 1- (p that none had used the browser) which was 1 - 0.92*20
    doesn't that come out as a negative number? :confused: x
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    What did you guys put as the skewness of the line graph? I thought it was negative but I'm not sure. :-/
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    (Original post by nicknickmac)
    doesn't that come out as a negative number? :confused: x
    0.92 to the power 20 doesnt!
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    (Original post by nju)
    any ideas on grade boundaries ???
    Not sure but the previous ones would suggest that it would be around 55-60 depending on how everyone did.
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    (Original post by fayola1337)
    What did you guys put as the skewness of the line graph? I thought it was negative but I'm not sure. :-/
    it was definitely negative
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    (Original post by nicknickmac)
    I got the same mean as youuu but my sd was like 849.. did you remember to divide by n-1? rather than just n?
    Yeah, I probably did get 849. Just can't remember :P Mixing up 1890 and 890 :P

    Definitely got 1890.625 though.
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    (Original post by fayola1337)
    What did you guys put as the skewness of the line graph? I thought it was negative but I'm not sure. :-/
    I put it was negatively skewed but almost symmetrical
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    (Original post by George_)
    Yeah, I probably did get 849. Just can't remember :P Mixing up 1890 and 890 :P

    Definitely got 1890.625 though.
    fab
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    (Original post by sreddy17)
    0.92 to the power 20 doesnt!
    ohhh to the power of 20, you wrote 0.92*20 haha :') x
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    For the 20 people with the browser question, what did people do?

    I did 1 - P(X=0) with X~B(n,p)

    to get 1 - 20C0 * 0.08^0 * 0.92^20 which just = 1 - 0.92^20 = 0.8113
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    (Original post by George_)
    For the 20 people with the browser question, what did people do?

    I did 1 - P(X=0) with X~B(n,p)

    to get 1 - 20C0 * 0.08^0 * 0.92^20 which just = 1 - 0.92^20 = 0.8113
    ye i did that i just wrote it! haha
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    first question did ppl just do 30/50 x 29/49 x 28/48
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    What did you guys get for the revenue one for the governemt for the cars?
    did you do 25/80 x 15000000 or whatever?
    the x by 1000?
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    (Original post by George_)
    For the 20 people with the browser question, what did people do?

    I did 1 - P(X=0) with X~B(n,p)

    to get 1 - 20C0 * 0.08^0 * 0.92^20 which just = 1 - 0.92^20 = 0.8113
    That's what I got too as far as I remember

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