Page 1 :
Essentials of a good average., , (i) Easy to understand., , (ii) Easy to compute, , (iii) Rigidly defined., , (iv) Based on all the items of series., , (v) Certain in character, , (vi) Least effect of a change in the sample., (vii) Capable of algebraic treatment., Merits of Arithmetic mean:, , (i) Simplicity, , (ii) Certainty, , (iii) Based on all values., , (iv) Algebraic treatment possible., , (v) Basis of comparison, , (vi) Accuracy test possible., , (vii) No scope for estimated value., Demerits of Arithmetic mean:, , (i) Effect of extreme values., , (ii) Mean value may not figure in the, series., , (iii) unsuitability., , (iv) Misleading conclusions., , (v) Can not be used in case of qualitative, phenomenon., , (vi) Gets distorted by extreme value of the, series.