A 50 foot length of steel chain weighing 10 pounds per foot is hanging from the top of a building. How much work is required to pull half of it to the top? 
Definitions:
Simple Events
In probability, an event that cannot be broken down further into simpler components.
Probabilities
They are measures of the likelihood or chance of an event occurring, expressed as a number between 0 and 1.
Sample Space
The collection of every potential result from a statistical experiment.
Itineraries
Detailed plans or routes of a journey.
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