A sample of 50 11th graders were asked to select a favorite pattern out of six choices. The data list below shows what their favorite color patterns were, and the accompanying frequency table and bar graph represent this data. In the bar graph, the height of the blue-gray bar is 4, the height of the green bar is 9, and so on. Suppose that, rather than being just a bar graph, the display you see above is a relative frequency bar graph. The vertical axis of the graph will be marked off in percents, from 0 percent up to 30 percent. What will be the height of the yellow bar?
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