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Reading bar chart with standard deviation

  1. Aug 18, 2014 #1


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    I don't know how the figure on the image posted works. If a grade is averaged at a B, which does this figure indicate my letter grade is? Is each box a standard deviation?

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  3. Aug 19, 2014 #2


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    The boxes represent quartiles , i.e., 25 percentiles ; the bottom of the box is the 25th percentile, the middle is the 50 percentile, a.k.a the median, etc. so that each box covers 25 percentile points of the data See : http://en.wikipedia.org/wiki/Box_plot
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