U.S. federal regulations require that operating companies clear all inactive offshore oil and gas structures within 1 year after production ceases. Researchers at the Louisiana State University Center for Energy Studies gathered data on both active and inactive oil and gas structures in the Gulf of Mexico (Oil & Gas Journal, Jan. 3, 2005). They discovered that the Gulf of Mexico has 2,175 active and 1,225 idle (inactive) structures. The following table breaks down these structures by type (caisson, well protector, or fixed platform). Consider the structure type and active status of one of these oil/gas structures.

a. List the simple events for this experiment.
b. Assign reasonable probabilities to the simple events.
c. Find the probability that the structure is active.
d. Find the probability that the structure is a well protector.
e. Find the probability that the structure is an inactive caisson.
f. Find the probability that the structure is either inactive or a fixed platform.
g. Find the probability that the structure is not a caisson.

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Structure Type Caisson Well Protector Fixed Platform Totals Active Inactive 598 503 1.447 4502175 225 1,225