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Q. ------ is used whenever the relative importance of the items in a series differs

Q. Square of Standard Deviation is known as

Q. Mean deviation is based on all values , so it is more

Q. Variance = -----

Q. ---- is the half distance between the third and first quartiles

Q. Index numbers are expressed in

Q. Cyclic variation Occur at intervals of more than ---- year

Q. A measure of dispersion is an average of

Q. ---- index number is called Ideal index number

Q. ----- are devices for measuring differences in the magnitude of a group of related variables