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AnswerThe geometric mean of Laspeyre's and Paasche's price indices is called Fisher's price index.
The index number in economic terms refers to an economic data figure reflecting price or quantity compared with a standard or base value. The best known index number is the consumer price index, which measures changes in retail prices paid by consumers.
A(m)/A(c)=0.5 is known as 50% modulation index. where, A(m)=amplitude of message signal A(c)=amplitude of carrier signal
uses of index
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