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:
Leadership
The act of guiding or influencing a group towards achieving a common goal through vision, action, and motivation.
Shared Influence
A situation where decision-making power and influence are distributed among members of a group or organization rather than centralized in a single leader.
Specialized Role
A position that requires a specific set of skills or expertise unique to a particular job or context.
Deliberate Influence
The intentional exertion of power or effect on others to bring about desired outcomes.
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