Quiz 2.1B - Explain briefly. 4. What percent of the...

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Quiz 2.1B AP Statistics Name: A density curve consists of a straight line segment that begins at the origin (0, 0) and has slope 1. 1. Sketch this density curve. What are the coordinates of the right endpoint of the segment? (Note that the right endpoint should be fixed so that the total area under the curve is 1. This is required for a valid density curve.) 2. Determine the median, the first quartile (Q 1 ), and the third quartile (Q 3 ). 3. Relative to the median, where would you expect the mean of the distribution to lie?
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Unformatted text preview: Explain briefly. 4. What percent of the observations lie below 0.5? Above 1.5? Runners World reports that the times of the finishers in the New York City 10-km run are normally distributed with a mean of 61 minutes and a standard deviation of 9 minutes. 5. Find the proportion of runners who take more than 70 minutes to finish. Draw a sketch to show this proportion. 6. Find the proportion of runners who finish in less than 43 minutes. Draw a sketch to show this proportion. Chapter 2...
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