Use the frequency histogram below to determine (a) the number of classes and (b) the class width.

• A. (a) 5 classes; (b) 2
• B. (a) 5 classes; (b) 3
• C. (a) 4 classes; (b) 3
• D. (a) 14 classes; (b) 2

Answer: (B)

Verified step by step guidance

1. Identify the number of classes by counting the number of bars in the histogram. Each bar represents a class.
2. Observe the range of each class by looking at the labels on the x-axis. For example, the first class is labeled '0-2'.
3. Calculate the class width by subtracting the lower boundary of a class from the upper boundary. For instance, for the class '0-2', the class width is 2 - 0 = 2.
4. Verify the class width by checking other classes. For example, the class '3-5' has a width of 5 - 3 = 2.
5. Ensure consistency in class width across all classes to confirm the calculation is correct.