Measures of Dispersion | Range | Inter Quartile Range | Dispersion | Statistics | Economics | CUET.

 Measures of Dispersion

KeyPoint: 

Range (R)

Inter Quartile Range

Quartile deviation (QD)

Mean deviation

Standard deviation

A) Range (R): It is the difference between the highest and the lowest value of the series.

R= H-L      where H is the highest value and L is the lowest value.

coefficient of R =    H-L / H+L

Find them

(A) Individual series:

find R and Coef. of R

if

3,8,2,5,6,9,10

sol:                    R = H-L

                              = 10-2

                                  

                      coef. of R = H-L / H+L

                                       = 10-2/10+2

                                       = 8/12

                                        = 0.67

(B) Discrete Series:

same formula