Figure 6a - This shows frequency distributions from dice rolls for a fair dice. The x or horizontal axis shows values from 1 to 6. The y or vertical axis shows frequency from 0 to 25000. The 6 columns have equal heights (about frequency = 170000).
Figure 6b - This shows frequency distributions from dice rolls for a loaded dice. The x or horizontal axis shows values from 1 to 6. The y or vertical axis shows frequency from 0 to 25000. The 6 columns have different heights with the highest frequency for value = 2 and the lowest frequency for value = 6.