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Independent-Office80 OP t1_j23mkfi wrote

Reply to comment by lector57 in ELI5_Random Variables? What really is the difference btw finding the probability of say..."getting 2 heads in a coin tossed three times" and "Finding the Probability mass function of a Random Variable 2"?? Their concepts are so similar but I feel I'm thinking wrong and there's actually a difference! by Independent-Office80

So they are just different representations of the same concept?

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lector57 t1_j23nv4r wrote

Like in algebra

x² is a function. A formula. X is the variable

Substitute x=2 and you get a value

In prob the random variable X can take different values.

The mass function is a formula. Substitute a specific value of X and you get the probability of obtaining the result X in the experiment

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Independent-Office80 OP t1_j23o0gg wrote

Oh. I get that now. Thanks. Could you elaborate on the inner workings of the PMF? Like, how it’s calculated on the inside? Thanks!

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lector57 t1_j23o467 wrote

It depends on the experiment/situation

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Independent-Office80 OP t1_j23o84h wrote

Oh. Doesn’t really explain much. But thanks a lot for taking your time to explain the previous. Means alot!

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