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The median of a set of data is the value of the middle point, when they are arranged in order.  For instance:

    # hours worked
    14 25 19 53 61 42 29
Arranging these data in order gives: 14, 19, 25, 29, 42, 53, 61. We can easily see that the middle value is 29. If there are an even number of points, average the two middle values. Some characteristics of the median are:
  • always exists for a set of data
  • unique
  • not strongly affected by extreme values