Define grand mean ( 
).
Definitions:
Life Expectancy
The average number of years an individual or a specific population group is expected to live, based on statistical averages.
Life Satisfaction
Life satisfaction is a measure of how people evaluate their lives as a whole rather than their current feelings, reflecting a person's perceived quality of life.
Type A Personality
A personality characterized by high levels of competitiveness, self-motivation, aggression, and a sense of urgency.
External Locus of Control
A belief system where individuals perceive that their lives are controlled by external factors beyond their control.
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