Consider the following frequency distribution. 
The total number of observations in the frequency distribution is ______.
Definitions:
Mining
The process of extracting minerals, metals, and other geological materials from the earth, typically from an ore body, lode, vein, seam, or placer deposit.
Transportation
The movement of goods and people from one location to another, encompassing various modes such as road, rail, air, and sea transport.
Unionization Rate
The proportion of workers in a specific sector or economy who are members of a labor union.
Retail Trade
The sale of goods and services to consumers for personal or household use, typically conducted through stores, online platforms, or direct sales.
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