A sociologist studying freshmen carried out a survey, asking (among other questions) how often students went out per week, how many hours they studied per day, and how many hours they slept at night. The table below provides the answers on the time slept and the time spent studying. 
Among the students who studied 4 or more hours, what proportion slept less than 6 hours a night?
Definitions:
Cellular Membrane
The cellular membrane, or plasma membrane, is the biological membrane that separates the interior of all cells from the outside environment, controlling the movement of substances in and out of cells.
Exocytosis
The active transport of materials out of the cell by fusion of cytoplasmic vesicles with the plasma membrane. Compare with endocytosis.
Plasma Membrane
The semipermeable membrane surrounding the cytoplasm of a cell, responsible for controlling the passage of substances in and out of the cell.
Vesicle
(vesicle) Any small sac, especially a small, spherical, membrane-enclosed compartment, within the cytoplasm.
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