🟪 1-Minute Summary
A random variable is a variable whose values are determined by chance. Discrete random variables take countable values (e.g., number of customers, dice rolls), while continuous random variables can take any value within a range (e.g., height, temperature). This distinction determines which probability distributions and statistical methods you use.
🟦 Core Notes (Must-Know)
What is a Random Variable?
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Discrete Random Variables
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Continuous Random Variables
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Key Differences
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🟨 Interview Triggers (What Interviewers Actually Test)
Common Interview Questions
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“Is this variable discrete or continuous: number of website visits per day?”
- [Answer: Discrete - countable]
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“Why does the distinction between discrete and continuous matter?”
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🟥 Common Mistakes (Traps to Avoid)
Mistake 1: Treating continuous variables as discrete
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🟩 Mini Example (Quick Application)
Scenario
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Solution
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🔗 Related Topics
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