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What is the importance of an index number, and how is it calculated?
(a)An index number is used to label datasets.
(b)Index numbers help compare changes over time and are calculated using a base year.
(c)Index numbers show trends and are calculated as a ratio using base and current year values.
(d)Index numbers are a simple way to present statistics visually.

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Important Questions on Tertiary and Quaternary Activities
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