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What a difference between Discrete and Continuous variable?

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What is the difference between a discrete and a continuous variable?

That is the correct phrasing of the question. If you want the answer, you need a maths reference like this one:

https://mathbits.com/MathBits/TISection/General/GraphContDiscrete.html

Comments  

Sorry for my English. And thank you. Very useful information for me.