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    I have attached the question and answer.

    What i don't understand is why standard deviation is 10? when standard deviation is actually root of 10.

    I get a completely different answer when using root 10. Is that fine?Name:  ImageUploadedByStudent Room1368369085.340878.jpg
Views: 73
Size:  67.3 KBName:  ImageUploadedByStudent Room1368369093.625124.jpg
Views: 82
Size:  151.8 KB


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    what was part (a)
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    (Original post by Putch1)
    I have attached the question and answer.

    What i don't understand is why standard deviation is 10? when standard deviation is actually root of 10.

    I get a completely different answer when using root 10. Is that fine?Name:  ImageUploadedByStudent Room1368369085.340878.jpg
Views: 73
Size:  67.3 KBName:  ImageUploadedByStudent Room1368369093.625124.jpg
Views: 82
Size:  151.8 KB


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    Clear printing error, I guess.

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    (Original post by TenOfThem)
    what was part (a)
    a) write down 3 properties of the normal distribution of X. :P


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    (Original post by Putch1)
    a) write down 3 properties of the normal distribution of X. :P


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    is it a paper
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    (Original post by TenOfThem)
    is it a paper
    yes january 2004 edexcel


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    (Original post by StUdEnTIGCSE)
    Clear printing error, I guess.

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    I thought so too but it is from the official edexcel 2004 mark scheme


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    (Original post by Putch1)
    yes january 2004 edexcel


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    The paper says sigma=10

    Where does your copy come from
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    (Original post by TenOfThem)
    The paper says sigma=10

    Where does your copy come from
    O.o that's odd

    http://www.tomred.org/s1.html




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    http://www.carlgauss.co.uk/PDFs/A-Le...an%20Paper.pdf



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    (Original post by Putch1)
    O.o that's odd


    ]
    That site is usually good

    The paper from edexcel is correct though
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    (Original post by TenOfThem)
    That site is usually good

    The paper from edexcel is correct though
    yea >.< still strange though. Thanks for helping TenOfThem! I was getting sooo confused for a while there.

    @StudentIGCSE thanks for the link!


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