Oh, dude, like, the numbers on a screw are just telling you how big it is. It's not a secret code or anything, just a way to know if it's gonna fit the hole you're trying to fill. So, if you see a screw that says, like, 4-40, it means it's a size 4 screw with 40 threads per inch. It's not rocket science, just screw science.
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The numbers for a screw typically refer to its size and length. The first number represents the diameter of the screw, while the second number indicates the length of the screw. For example, a screw labeled as 4-40 would have a diameter of 4mm and a length of 40mm. It's important to match the screw size and length to the specific requirements of the project to ensure a secure fit.
I think you mean an Archimedes screw.
40
The "mean" of a group of numbers is their "average". It doesn't tell you what the numbers are, or even how many numbers there are.
No, the geometric mean is not the same as the mean of two numbers.
Given a set of numbers, and its mean, we can find the difference between each of the numbers and the mean. If we take the mean of these differences, the result is called the mean deviation of the numbers.