The higher the standard deviation, the more variation there is in the data and the less accurate the mean is. The standard deviation equal to 0 indicates that every value in the dataset is exactly equal to the mean. The closer the standard deviation is to zero, the lower the data variability and the more reliable the mean is. The purpose of the standard deviation is to help you understand if the mean really returns a "typical" data. To put it differently, the standard deviation shows whether your data is close to the mean or fluctuates a lot. The standard deviation is a measure that indicates how much the values of the set of data deviate (spread out) from the mean.
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