<prompt> True about Standard Deviation CurveMean MedianMean 2 X MedianMedian varianceStandard deviation 2 variance  <response>: A Mean Median STANDARD DEVIATION: The standard deviation is the most frequently used measure of deviation. In simple terms, it is defined as Root -Means - Square- Deviation. SD is the average degree to which scores deviate from the mean. More precisely, you measure how far all your measurements are from the mean, square each one, and add them all up. The result is called the variance. Take the square root of the variance, and you have the standard deviation. 