Probability Distributions & Descriptive Statistics - Discrete & Continuous random variables

4 important questions on Probability Distributions & Descriptive Statistics - Discrete & Continuous random variables

2. What is a discrete random variable?

A variable that can take on countable values (finite or infinite countable).

3. What is a continuous random variable?

A variable that can take on any value in an interval (uncountably infinite).

4. What is a probability distribution?

It shows how probabilities are distributed over the values of a random variable.
For discrete r.v.s → Probability Mass Function (PMF)
For continuous r.v.s → Probability Density Function (PDF)
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5. What is the rule for the PMF?

All possible probabilities must add up to 1.

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