Imagine you have a bunch of numbers, and you want to know what possible values these numbers could have. That's what a numerical range is -- it tells you the upper and lower bounds of the numbers.
For example, let's say you have the numbers 2, 4, and 6. The numerical range would be between 2 and 6, because those are the smallest and largest numbers in the group.
Now, let's say you want to know how spread out these numbers are. That's where the numerical radii come in. It tells you how "far apart" the numbers are from each other.
In our example, the numerical radii would be 2, because the difference between the smallest and largest number (6 - 2 = 4) is 4, and if we divide that by 2 (because we're looking at the difference between two numbers in the group), we get 2.
So, a workshop on numerical ranges and radii would be a gathering of people who want to learn more about how to calculate these values for groups of numbers. They may talk about different formulas for calculating the numerical range and radii, what they can tell us about the numbers in our groups, and how they can be used in different fields like mathematics, physics, and engineering.