Answer:
So, the scale is basically what numbers you use and how far apart you put them.
To make a scale on the x-axis for your histogram, you need to figure out what range of numbers would be best to use. This might be 1 through 10, or 0 through 100, or maybe even fifty through eighty.
It could be anything. It all depends on how high your highest given data number is, and how low your lowest given data number is.
Attached is an example of a histogram. Its scale is 0 through 25.
This is just an example, and you have to decide the best numbers for your histogram.