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The Grand Canyon and the Colorado River are beautiful rugged and sometimes dangerous A physician has recorded for a 5 year period the number of visitor injuries at different landing points for commercial boat trips down the Colorado River in both the Upper and Lower Grand Canyon Upper Canyon Number of Injuries per Landing Point Between North Canyon and Phantom Ranch 3 4 11 45 584 14 Lower Canyon Number of Injuries per Landing Point Between Bright Angel and Lava Falls 71107 6 3 15 201 12 3 1 USE SALT a Compute the mean median and mode for injuries per landing point in the Upper Canyon What is the mean Round your answer to four decimal places 3 6364 What is the median 4 What is the mode b Compute the mean median and mode for injuries per landing point in the Lower Canyon What is the mean Round your answer to four decimal places 4 2143 What is the median 2 5 What is the mode c Compare the results of parts a and b The Lower Canyon mean is greater while the median and mode are the same The mean median and mode are greater for the Upper Canyon The Lower Canyon mean is greater while the median and mode are less The mean median and mode are greater for the Lower Canyon d The Lower Canyon stretch had some extreme data values Compute a 5 trimmed mean for this region Round your answer to four decimal places Compare this result to the mean for the Upper Canyon computed in part a The trimmed mean is closer to the Upper Canyon mean The trimmed mean is the same as the Upper Canyon mean

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