According to a Human Resources report, a worker in the industrial countries spends on average 419 minutes a day on the job. Suppose the standard deviation of time spent on the job is 31 minutes. a. If the distribution of time spent on the job is approximately bell shaped, between what two times would 68% of the figures be?
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b. If the distribution of time spent on the job is approximately bell shaped, between what two times would 95% of the figures be?
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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?
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d. If the shape of the distribution of times is unknown, approximately what percentage of the times would be between 359 and 479 minutes?
enter percentages rounded to 1 decimal place % (Round the intermediate values to 3 decimal places. Round your answer to 1 decimal place.)

e. Suppose a worker spent 400 minutes on the job. What would that worker’s z score be, and what would it tell the researcher?
z score = enter the z score rounded to 3 decimal places (Round your answer to 3 decimal places.)

This worker is in the lower half of workers but within select an option standard deviation of the mean.