probability distributions

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4 Terms

1
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What’s the difference between probability mass and probability density functions?

PMFs describe discrete distributions; PDFs describe continuous distributions.

2
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Why do exact values have 0% probability in continuous distributions?

Because there are infinite possible values, only ranges have measurable probability.

3
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What is a cumulative distribution function (CDF)?

It shows the probability that a value is less than or equal to a given number, rising from 0% to 100%.

4
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What are two uses of CDFs?

Calculating range-based probabilities and comparing different distributions.