What is occurrence and variance?

Excuse me, could you please clarify the terms "occurrence" and "variance" in the context you're referring to? Are we talking about statistical concepts, or perhaps they relate to some specific financial or cryptocurrency phenomenon? I'm a bit uncertain as to how these terms apply in the field we're discussing, so if you could elaborate on their meanings and significance, that would be greatly appreciated. Understanding these terms will help me better grasp the overall context and provide a more informed response.