Mathematics, 13.03.2020 02:33 markitakimbrough69
An oil exploration company purchases drill bits that have a life span that is approximately normally distributed with a mean equal to 74 hours and a standard deviation equal to 12 hours. (Round your answers to four decimal places.) (a) What proportion of the company's drill bits will fail before 65 hours of use? (b) What proportion will last at least 65 hours? (c) What proportion will have to be replaced after more than 83 hours of use?
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An oil exploration company purchases drill bits that have a life span that is approximately normally...
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