In Mean deviation, deviations are measured from

(a) Mean 

(b) Median 

(c) mode 

(d) All these

What is the relation between mean, mode, median.

— is defined as the reciprocal of the mean of the reciprocal of these value

(a)H.M 

(b)G.M 

(c)A.M 

(d)S.D

Standard deviation of a series can have minimum value of —–

(a) Zero 

(b) One 

(c) Two 

(d) Three

 In —- signs are ignored 

(a) S.D

(b)Mean 

(c) Both 

(d) None

Laspeyrs formula does not obey 

(a) Factor reversal test 

(b) Time reversal test 

(c) Both 

(d) None

Fishers ideal index formula satisfies —- test 

(a) Factor reversal test 

(b)Time reversal test 

(c) Both 

(d) none

Fisher’s formula satisfies —- test 

(a) Unit test 

(b) Time reversal Test 

(c) factor Reversal test 

(d) All