Question

The index numbers of different groups of industrial output of a city and the weights of these groups are given below. Find the index number of the industrial production.

Group	Index number	Weight
iron	390.2	30
textile	247.6	31
chemical	510.2	18
Engineering goods	403.3	17
Cement	624.4	4

Answer 1

Index number of industrial production 

\(I= \frac{\sum IW}{\sum W}\)

\(=\cfrac{37918.9}{100}= 379.19\)