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9. The ages of video renters at Kartye's Quick Video last Saturday were as follows: 21 15 19 29 16 19 23 23 12 39 22 15 19 37 49 46 19 22 15 10 a) Determine the median. b) Determine the mode. c) Calculate the mean. Use proper summation notation used in this course. d) Identify the type of skewness of the data. 10. Evaluate the following summations (being as efficient as possible) : 33 a) 1=3 b ) 1=1