XI_Economics_Statistics_Ch-11_Dispersion_Practice Worksheet_1

Class XI

Statistics for Economics

Chapter - 11

Measures of Dispersion

Worksheet - 1

Ques.1. Tick the correct answer.

(i) Lorenz Curve is used to measure the level of:

      (a) Disturbances

      (b) Coefficient

      (c) Inequalities

      (d) Correlation

(ii) Mean Deviation can be computed using:

      (a) Median

      (b) Mean

      (c) Mode

      (d) All of the above

(iii) Standard Deviation (S.D.) can be calculated using:

      (a)

     

      (b)

      (c)

      (d)

(iv) Variance is

      (a)

      (b)

      (c)

      (d)

(v) Range & Coefficient of Range for data series 4, 7, 8, 46, 53, 77, 8, 1, 5, 13 are:

      (a) 67, 0.97

      (b) 76, 0.50

      (c) 68, 0.87

      (d) 76, 0.97

Ques.2. If Standard Deviation (S.D.) is 12.7, how would this value be affected by the following changes:

      (i) Each observation is added by 5.

      (ii) Each observation is multiplied by 5.

Ans.

Ques.3. The Coefficient of Variation (C.V.) of a data series is 58. The S.D. is 21.2. What is Arithmetic Mean?

Ques.4. Calculate Mean Deviation from Mean.

Sales	102	100	110	114	118	122	126
Days	3	9	25	35	17	10	1