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    This is from the Edexcel Statistics and Mechanics textbook for the new spec:

    Estimate the number of days in September 2015 where the daily mean temperature in Camborne is more than one standard deviation greater than the mean.

    It's C and I got 8 days when the answer is 5 days?
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    (Original post by GCSE 9)
    Estimate the number of days in September 2015 where the daily mean temperature in Camborne is more than one standard deviation greater than the mean.
    so the temperature limit which you have to look above is STANDARD DEVIATION + MEAN. So the S.D could be 3.1 and the mean temperature could be 20 degrees. This means the values you have to look for are above 3.1+20.
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    I would help, but I believe we need some more data for this question ^
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    (Original post by Bonnie 99)
    I would help, but I believe we need some more data for this question ^
    Thanks, just linked the question and my working out
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    (Original post by brownguytorule)
    so the temperature limit which you have to look above is STANDARD DEVIATION + MEAN. So the S.D could be 3.1 and the mean temperature could be 20 degrees. This means the values you have to look for are above 3.1+20.
    I did do that, can you see my working out and where i went wrong
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    Guys I realised where I went wrong 14x1.86=26.04 not 19.74
 
 
 
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