Standard deviation is a useful way to estimate the “spread” in a set of numbers. In the example, each person’s height is measured relative to the average of 106.33 mm. Because some heights are much larger or smaller, the standard deviation of 32.79 mm reflects that broad range. If everyone’s height were clustered closer to the average—say, around 105 mm to 108 mm—the standard deviation would be smaller. This shows how standard deviation can reveal whether data points are tightly packed together or scattered more widely, making it an important tool for understanding the spread of any measured quantity.
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