Step 3 of 5: Find the class width for this histogram.

Answer

The class width of a histogram is the difference between the upper and lower boundaries of any single class interval (bar). Looking at the horizontal axis (Scores), we can identify the boundaries for the bars. For example, the first bar starts at 70.5 and ends at 75.5. To calculate the class width, subtract the lower boundary from the upper boundary of this interval: 75.5 - 70.5 = 5. You can verify this with any other class, such as the second interval: 80.5 - 75.5 = 5. Therefore, the class width is 5.