After completion of this chapter, students will be able to:
Mean deviation The average of the absolute values of the deviation of each item from mean, median or mode is known as a mean deviation. Standard deviation Standard deviation is the positive square root of the arithmetic mean of the square of deviations of given data taken from the mean.
Standard deviation is the position square root of the arithmetic mean of the squares of the deviations of the given observation from their arithmetic mean.
Merits and Demerits of Standard Deviation