42 is the variance. To find the standard deviation, take the square root of the variance. The square root of 42 is 6.481.
This rule tells us that around 68% of the data will fall within one standard deviation of the mean; around 95% will fall within two standard deviations of the mean; and 99.7% will fall within three standard deviations of the mean.
Answer: The value of standard deviation, away from mean is calculated by the formula, X = µ ± Zσ The standard deviation can be considered as the average difference (positive difference) between an observation and the mean.
Suppose 5 samples of hue are taken using a simple HSV model for color, having values 355, 5, 5, 5, 5, all a hue of red and "next" to each other as far as perception is concerned. But the simple average is 75 which is far away from 0 or 360, close to a yellow-green.
What is a better way to calculate this mean and associated std?
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