Question

what is mean by price index number? ​

Answer 1

A price index (plural: "price indices" or "price indexes") is a normalized average (typically a weighted average) of price relatives for a given class of goods or services in a given region, during a given interval of time. ... Consumerprice index. Producer price index.

Answer 2

A price index (plural: "price indices" or "price indexes") is a normalized average (typically a weighted average) of price relatives for a given class of goods or services in a given region, during a given interval of time. ... Consumer price index. Producer price index.