Science:Math Exam Resources/Courses/MATH102/December 2015/Question 19 (e)
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Question 19 (e) |
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In deciding how long a resident’s shift in the emergency room should be, the Chief of Staff at Vancouver General Hospital would like to minimize the average rate at which errors are made. Let be the number of errors made by a resident from the start of a shift until t hours into the shift. The instantaneous rate of change of errors made is (e) Sketch . Label any minima, maxima and/or inflection points. On the same axes, draw a line that shows when the average error rate is minimized. |
Make sure you understand the problem fully: What is the question asking you to do? Are there specific conditions or constraints that you should take note of? How will you know if your answer is correct from your work only? Can you rephrase the question in your own words in a way that makes sense to you? |
If you are stuck, check the hint below. Consider it for a while. Does it give you a new idea on how to approach the problem? If so, try it! |
Hint |
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Solve for to find extremal points. |
Checking a solution serves two purposes: helping you if, after having used the hint, you still are stuck on the problem; or if you have solved the problem and would like to check your work.
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Solution |
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Please rate my easiness! It's quick and helps everyone guide their studies. From previous parts of this question, we know that . The plot shows this function. Note that when and Thus is the only extremal point, and it is an inflection point. The average error rate is . Answer: the minimal value is . |