How to calculate the social inventory of cigarettes through the cigarette inventory of some customers?

According to the proportion of some surveyed retailers' business formats, geographical attributes and other indicators, classification accounts for the total number of retail customers. Example: There are 1000 retail customers in a certain area, including 500 grocery stores, 200 supermarkets, 100 tobacco and liquor stores, 150 convenience stores, 20 shopping malls and 30 other types. Among them, 100 households were investigated, including 50 grocery stores and 20 supermarkets. Taking groceries as an example, if the average inventory of 50 households surveyed is 100, it can be estimated that the total social inventory of grocery customers in the whole region is 100×500, and the total can be obtained by calculating others in turn. This is because retail customers of the same format have similarities in cigarette business. In addition, when selecting the respondents, we should pay attention to the unified distribution of format, scale and geographical location as much as possible, and the calculated overall inventory is more valuable for reference.