There are some occupations that have very few women working in them. (There is a definate difference between men and women)
There are very few women engineers, programmers and electronic techs. That is in a way odd, most men are color blind to some degree and electronics techs need to be able to use color to read resistor coding. When it comes to dexterity and perception of things like color and design women have the edge. Men have the edge where physical strength, stamina and endurance are concerned.
There are always exceptions.
Why is this important? Men and women are not the same physically or mentally. Some ethnic groups have advantages and disadvantages along the same lines.
Why? I am not sure.
Color coding is no longer used. Modern SMT components are not color coded. They are either not marked at all, or marked with a text. Here is an example that shows both approaches.
That's why they invented meters!
Because the cool kids don’t do math.
Freight handlers come to mind.