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2021-01-08 Conditional Probability shark 1 min read

Q: What is the expected value of a d6, if I tell you the outcome is at least 4?

A: Outcomes would be 4, 5, 6 and each has $\frac{1}{3}$ likelihood.

$E(X) = \frac{1}{3} \times \frac{(4+6) \times 3}{2} = 5$

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