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According to a human resources report, a worker in the industrial countries spend on average 419 minutes a day on the job. Suppose the standard deviation of the time spent on the job is 29 minutes.
A. If the distribution of the job is approximately bell shaped, between what two times would 68% of the figures be?
B. If the distribution of time spent on the job is approximately bell shaped, between what two times would 95% of the figures be?
C. If the distribution of time spent on the job is approximately bell shaped, between what two times would 99.7% of the figures be?
D. If the shape of the distribution of times is unknown, approximately what percentage of times would be between 358 and 480 minutes?
E. Suppose a worker spent 400 minutes on the job.what would that workers z score be, and what would it tell the researcher?
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