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    (Original post by Anon_98)
    I'm stuck on part 4)b) in this paper, can anyone help pls:

    https://1a388b28f5ce9318f837a64962fc...%20Edexcel.pdf

    I know that mean= ∑xf

    but I've forgotten how to find x?


    I worked it out as the class width + multiplied it by the frequency but it was obviously wrong.
    Find midpoint of the foot length values then find ∑xf
    Mean is ∑xf divided by total frequency
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    (Original post by kiwifruit99)
    Bricking myself for tomorrow... Oh well I just need 55/75 min to get an A so hopefully fingers crossed ✌🏽


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    I think.. at this point, unless you are cramming, get enough sleep. Good luck! :cake:
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    Will the paper tomorrow be easier or harder?
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    (Original post by kiwifruit99)
    X is the midpoint so for the first one-
    10 + 12/ 2 = 11
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    (Original post by Susi3b)
    Find midpoint of the foot length values then find ∑xf
    Mean is ∑xf divided by total frequency
    Ah, thanks a lot!
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    (Original post by ChilliLemon)
    Here is the jan 2016!!
    Thankyou, do you have the ms aswell
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    Name:  ImageUploadedByStudent Room1465949553.804651.jpg
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    A lot of people were asking for this so I made a list up till the chapter on probability. Everything after that is included in the formula booklet. I know it's a bit late but I guess people will be waking up early tomorrow to revise anyway...
    Good luck!! X 😊


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    (Original post by kiwifruit99)
    Name:  ImageUploadedByStudent Room1465949553.804651.jpg
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    A lot of people were asking for this so I made a list up till the chapter on probability. Everything after that is included in the formula booklet. I know it's a bit late but I guess people will be waking up early tomorrow to revise anyway...
    Good luck!! X 😊


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    Thanks! I actually stayed up after suhoor ._.
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    Good luck everyone!

    I'm going to be doing the exam with less than 3 hours of sleep. :ahee: Fantastic start! :yy:
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    (Original post by undercxver)
    Good luck everyone!

    I'm going to be doing the exam with less than 3 hours of sleep. :ahee: Fantastic start! :yy:
    GO TO BED.

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    only had 3 hours sleep yolo
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    (Original post by SuperHuman98)
    only had 3 hours sleep yolo
    same *high five*
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    Posted from TSR Mobile

    How does coding work with the mean, variance and standard deviation?
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    How do I work out the percentages of a box & whisker plot!!

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    (Original post by undercxver)
    Good luck everyone!

    I'm going to be doing the exam with less than 3 hours of sleep. :ahee: Fantastic start! :yy:
    Same here.I couldn't sleep much due to e3 excitement.
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    (Original post by Adorable98)
    How do I work out the percentages of a box & whisker plot!!


    For part a the lowest mark is Q1 which is 30
    For part b the lowest mark is Q3 which it seems to be around 46? And this is because 75% of the data lies above Q1 and 25% above Q3.

    Hope this helps and good luck x
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    (Original post by mal100)
    For part a the lowest mark is Q1 which is 30
    For part b the lowest mark is Q3 which it seems to be around 46? And this is because 75% of the data lies above Q1 and 25% above Q3.

    Hope this helps and good luck x
    Thank you!!, If the question was asked the other way round so if they asked for the highest mark for (a) & (b), what would the answer be? & Good luck to you as well!!
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    Formula for skewness of quartiles ?
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    (Original post by Kadak)
    Formula for skewness of quartiles ?
    I think it was something like

    If Q3-Q2 > Q2-Q1 - Positive Skew
    If Q3-Q2 < Q2-Q1 - Negative Skew
    If Q3-Q2 = Q2-Q1 - No Skew / Symmetrical
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    (Original post by veryam*****ious)
    I think it was something like

    If Q3-Q2 > Q2-Q1 - Positive Skew
    If Q3-Q2 < Q2-Q1 - Negative Skew
    If Q3-Q2 = Q2-Q1 - No Skew / Symmetrical
    And don't mix this up with the quartile coefficient of skewness.
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    dya reckon it will be an easy or a hard paper?
 
 
 
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