Question 1 · Easy
The median of a set of observations is the:
- AValue that occurs most often in the data
- BMiddle value when the data are arranged in order
- CSum of all the values divided by their number
- DDifference between the largest and smallest value
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Answer: B · Middle value when the data are arranged in order
The median divides an ordered set of observations into two equal halves. With an odd number of values it is the middle one; with an even number it is the average of the two middle values. Because it depends on position rather than size, it is not pulled by a few extreme values. This makes it useful for skewed data such as hospital stay.
- A: The most frequent value is the mode.
- C: The sum divided by the number of values is the arithmetic mean.
- D: The difference between the extremes is the range, a measure of spread.