A marketing researcher at a computer company did a study examining user satisfaction with two operating systems.A total of 300 users were surveyed on the type of operating system used and their satisfaction with it.Use the following data set to answer questions 6-14: 
What is the probability that a user is satisfied with either system 9 or system 10?
Definitions:
Availability of Substitutes
The presence of alternative products or services that can satisfy the same needs or wants as the original product.
Own Price Elasticity
Measures the responsiveness of the quantity demanded of a good to a change in its own price.
Anne's Apple Pies
A fictional or specific business entity known for producing or selling apple pies.
Market Share
The portion of a market controlled by a particular company or product.
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