A work sampling method is used to determine the proportion of the time a worker is idle. The following information was gathered on a random basis. 
What is the proportion of idle time observed for this worker?
Definitions:
Mass Extinctions
Events in Earth's history where large numbers of species become extinct in a relatively short period of time.
Fossil Record
The collection of all known fossils and their placement in rock formations and sedimentary layers, providing evidence of past life and evolutionary histories.
Protocells
Simple, self-organized, prebiotic structures that are considered the precursors to living cells.
Eukaryotic Cells
Cells that contain a nucleus and other organelles enclosed within membranes, differentiating them from prokaryotic cells.
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