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A psychologist developed a test designed to help predict whether production-line workers in a large industry will perform satisfactorily. A test was administered to all new employees in a corporation. At the end of the first year of work, these employees were rated by their supervisors: 18% were rated excellent, 53% were rated satisfactory and 29% were rated poor. 48% percent of those rated excellent passed the psychologist's test, as did 22% of those rated satisfactory and 12% of those rated poor.
a) What is the probability that a randomly selected employee will pass the psychologist's test?
b) What is the probability that an employee who doesn't pass the test will be rated excellent or satisfactory?
need to define one statistic and calculate value
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