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 person uses system 9?
Definitions:
Psychological Development
The changes in cognitive, emotional, and social capacities and behaviors across the lifespan, influenced by biological, environmental, and cultural factors.
Life Span
The length of time for which a person or organism lives or a thing functions.
Physical Maturation
The process of physical growth and development, from infancy through adulthood, including the development of both primary and secondary sex characteristics.
Parents
Caregivers of offspring in their own species; in humans, typically comprised of a father and mother, who provide physical, emotional, and social support for their children.
Q9: Jill took an English test and is
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Q32: It is always the case that _
Q54: It is possible for two variables to
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Q95: A z score of _ represents a
Q97: The standard deviation of the sampling distribution
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Q148: A _ indicates the likelihood that an
Q149: What is the difference between a permutation