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### Poll

**What is the most difficult concept to understand in probability?***How to calculate a PDF when give a cumulative distribution function. (59%, 304 Votes)*- In MATH 105, there are no difficult topics on probability. (17%, 87 Votes)
- What a random variableĀ is. (14%, 70 Votes)
- The difference between discrete and continuous random variables. (11%, 55 Votes)

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