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:
Expectancy Theory
A motivational theory suggesting that an individual's motivation is based on their expectations regarding outcomes of specific behaviors.
Motivation Levels
The intensity, direction, and persistence of effort a person shows in reaching a goal.
Components
The distinct parts or elements that make up a whole system or object.
Equitable
Equitable means characterized by fairness, impartiality, and justice in the way people are treated or decisions are made.
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