Mean detion is -
Measure of dispersion
Measure of dispersion
A range
An average
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