The image shows a histogram representing the final grade scores, with the x-axis labeled as "Final Grade Score" and the y-axis labeled as "Frequency." The question asks how many classes there are. In this context, "classes" refer to the number of intervals (or bars) in the histogram.

To count the number of classes, we can observe the number of bars (rectangles) in the histogram. Let me count them:

There are 10 classes in the histogram.

Would you like more details on this or explanations?

Here are 5 related questions that might interest you:

1. How do we determine the width of each class interval in a histogram?
2. What is the range of the final grade scores based on this histogram?
3. How can we calculate the mean or median score from the histogram?
4. Why are some classes (bars) taller than others in a histogram?
5. How does the frequency distribution affect the interpretation of the final grade scores?

Tip: In histograms, each bar represents the frequency of data points falling within a specific interval, known as a "class." The height of the bar corresponds to the frequency.