Whistling dolphins. Marine scientists who study dolphin communication have discovered that bottlenose dolphins exhibit an individualized whistle contour known as their signature whistle. A study was conducted to categorize the signature whistles of 10 captive adult bottlenose dolphins in socially interactive contexts (Ethology, July 1995). A total of 185 whistles were recorded during the study period; each whistle contour was analyzed and assigned to a category by a contour similarity (CS) technique. The results are reported in the table on p. 138. Use a graphical method to summarize the results. Do you detect any patterns in the data that might be helpful to marine scientists?

Whistle Category Number of Whistles Type a 97 Type b 15 Type c 9 Type d 7 Type e 7 Type f 2 Type g 2 Type h 2 Type i 2 Type j 4 Type k 13 Other types 25