According to the Current Population Survey, the following table summarizes probabilities for randomly selecting a full-time student in various age groups: 
If we randomly select a full-time student, the probability that the student is 20-34 years old is:
Definitions:
Acoustical
Related to sound or the science of sound, including its production, transmission, and effects.
Good Eyesight
The ability of the eye to see clearly and distinguish fine details at various distances.
Priming Pheromones
Chemical signals released by organisms to trigger a long-term behavioral or developmental response in other members of the same species.
Chemical Signals
Molecules released by organisms that influence the behavior or physiology of other organisms.
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