Every human activity has variability. Natural patterns of data of any process are bell-shaped curves. Most of the human processes follow a bell shaped curve. Take for example, the internet connectivity speed. Even though the connectivity speed may be 64kpbs, it is not at that speed at every point of time. It keeps on varying. At some time it may be overshoot the specified speed, and at others, remains below that. On an average, however, the connectivity is 64kbps.Mean is the area around which most of the data points tend to cluster. Going away from the mean on either sides of the curve, values the clustering gradually come down.
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