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    I don't know whether I'm just being stupid or what, but I'm seriously aggravated by this dumb question in my S1 paper. It said find the mean of some discrete data, and I've spent 10 minutes looking through the textbook and nowhere does it say how to find the mean of discrete data. It asks questions about it as if it assumes you know how to do it but it doesn't tell you how. It gives you like the sum of x and the sum of x squared, but seriously, how the hell do you work it out?!
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    Please post the original problem.

    Variance = Square of mean minus mean of squares.

    Mean of discrete data is just the sum divided by the number.
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    (Original post by urbanamore)
    I don't know whether I'm just being stupid or what, but I'm seriously aggravated by this dumb question in my S1 paper. It said find the mean of some discrete data, and I've spent 10 minutes looking through the textbook and nowhere does it say how to find the mean of discrete data. It asks questions about it as if it assumes you know how to do it but it doesn't tell you how. It gives you like the sum of x and the sum of x squared, but seriously, how the hell do you work it out?!

    If you're using the Edexcel S1 Textbook (Keith Pledger) it's on pages 17 and 29, other than that post the question so people can help you
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    (Original post by urbanamore)
    I don't know whether I'm just being stupid or what, but I'm seriously aggravated by this dumb question in my S1 paper. It said find the mean of some discrete data, and I've spent 10 minutes looking through the textbook and nowhere does it say how to find the mean of discrete data. It asks questions about it as if it assumes you know how to do it but it doesn't tell you how. It gives you like the sum of x and the sum of x squared, but seriously, how the hell do you work it out?!
    Why don't you post the original question and then we can help you get to the bottom of it?

    Stats is notorious for weird questions, but we won't know unless you give us more info
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    (Original post by urbanamore)
    I don't know whether I'm just being stupid or what, but I'm seriously aggravated by this dumb question in my S1 paper. It said find the mean of some discrete data, and I've spent 10 minutes looking through the textbook and nowhere does it say how to find the mean of discrete data. It asks questions about it as if it assumes you know how to do it but it doesn't tell you how. It gives you like the sum of x and the sum of x squared, but seriously, how the hell do you work it out?!

    \frac{1}{n}\sum\limits_{i=1}^n x_i = \bar{x}
    If you have n, if not as everyone else says please post the q
 
 
 
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