You mean in real world or in math? In real world, correct, assuming "dot" and "number line" are consist of real world materials. In math, you need to define "

You mean in real world or in math? In real world, correct, assuming "dot" and "number line" are consist of real world materials. In math, you need to define "randomly placing a dot" first, because it's proven there isn't a uniform distribution over real numbers ("pick randomly" is usually a colloquial way to say "pick from a uniform distribution.")