Measure of dispersion among the following is:

Ans: a (Range)Ref: Park, 20lh ed. Pg. 750, 19th ed. Pg. 700Measures of dispersion include:a) Mean deviation b) Standard deviation c) RangeThe range is the simplest measure of dispersion. It is the difference between the highest and lowest figures in the sample.Mean deviation is the average of the deviations from the arithmetic mean, and is given by the formulaStandard deviation is the most frequently used measure of deviation. It is defined as the root mean square deviation.K-l Measures of central tendency include:* The mean* The mode - not affected by the extreme items.* The median Standard normal curve is a smooth bell-shaped, perfectly symmetrical curve, based on an infinitely large number of observations. The total area of the curve is 1; its mean is zero, and standard deviation is zero. The mean, median, mode all coincide.The distance of a value (x) from the mean - (x) of the curve in units of standard deviation is called "relative deviate or standard normal variate" (Z).