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In a histogram with bin widths of w1=5w_1 = 5 and w2=10w_2 = 10, suppose the density d=frequencywd = \frac{\text{frequency}}{w}. If the first bin has frequency f1=20f_1 = 20 and the second bin has frequency f2=40f_2 = 40, which of the following describes their densities?