Mean detion is -

Ans. is 'b' i.e., Measure of dispersion Mean detion is an absolute measure of variation or dispersion. Mean detion (MD) It is the average of the detion from the arithmetic mean. MD -- E (x - )1) 11 o To calculate the mean detion following steps to be followed - First calculate the arithmetic mean. Then every single value is deducted from arithmetic mean to calculate detion from mean (x - x). Now each of these values of detion from mean are added and then divided by the numbers of value (r1) to obtained mean detion. Example ---> The diastolic blood pressure of 10 individuals is as follows - 83, 75, 81, 79, 71, 95, 75, 77, 84 and 90. The mean detion is calculated :? Mean detion Diastolic B.P. Arithmetic Mean Detion from the mean (x - 83 81 2 75 81 -6 81 81 0 79 81 -2 71 81 -10 95 81 14 75 81 -6 77 81 -4 84 81 3 90 81 9 Total = 810 Total = 56 (ignoring +- sign) 8 10 56 Mean = 10-- 81 The Mean detion 10-- 5.6