Mathematics, 28.10.2020 01:00 ghernadez

The length of time needed to complete a certain test is approximately normally distributed with mean 55 minutes and standard deviation 6 minutes. Show your work. a) How much time is enough to finish the test for 90% of all test takers?

b) When a student needs more the 70 minutes, special arrangements need to be made for a student to finish the test outside of normal class hours. What proportion of students are expected to need special arrangement?

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