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Math · Statistics And Probability
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I want answers to queston 14,15,16.

14. -12 points MendStat14 6.E.065 My Notes Ask Your Teacher Find the probability that z lies between z 1.13 and z 1.13 Round your answer to four decimal places.) Need Help? Read t Talk to a Tutor -4 points MendStat 146 E.067 My Notes Ask Your Teacher It is estimated that the mean life span of oil-drilling bits is 70 hours. Suppose an oil exploration company purchases d bits that have a life span that is approximately normally distributed with a mean equal to 70 hours and a standard deviation equal to 12 hours. (Round your answers to four decimal places.) (a) What proportion of the companys d bits will fail before 55 hours of use (b) What proportion will last at least 55 hours? c) What proportion will have to be replaced after more than 85 hours of use Need Help? Read It Talk to a Tuto 16. -4 points MendStat 14 6.E.087 My Notes Ask Your Teacher Suppose that the IRS assigns auditing rates per state by randomly selecting 50 auditing percentages from a normal distribution with a mean equal to 1.65% and a standard deviation of 0.35%. (a) What is the probability that a particular state would have more than 2% of its tax returns audited? (Round your answer to four decimal places.) b) What is he expected value o x, the number of states that wi have more than 2% of their in tax returns audited? (Round your answer to three decimal places come

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