AutoTrader.com would like to test if a difference exists in the age of three different types of vehicles currently on the road: trucks, cars, and vans. The following data represent the age of a random sample of trucks, cars, and vans. 
The grand mean for these observations is ________.
Definitions:
Intercompany Scope
The extent of activities, transactions, and engagements that take place between different entities within the same corporate group or parent company.
Strategic Fit
The alignment between a company's strategies and its external environment, including markets, competition, and regulations, to ensure effectiveness and enhance performance.
Supply Chain Strategy
The planning and management approach to sourcing, manufacturing, and delivering products and services.
Operations
Activities involved in the day-to-day running of a business for producing and delivering products or services to customers.
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