Timeline for Conditional Expectation, discrete?
Current License: CC BY-SA 4.0
8 events
| when toggle format | what | by | license | comment | |
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| Mar 29, 2020 at 21:25 | history | edited | Tim | CC BY-SA 4.0 |
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| Mar 29, 2020 at 20:59 | comment | added | StubbornAtom | Don't always rely on the formula of $E[X\mid Y=y]$ you gave. For any event $A$ with positive probability, $E[X\mid A]$ is by definition $E[XI_{A}]/P(A)$ where $I_A$ is an indicator function. For this problem you have $E[XI_{X\in\{1,2\}}]=\sum_{j\in\{1,2\}}jP(X=j)$, which is what you gave as your answer. You have to divide this by $P(X\in\{1,2\})$ to reach the correct answer. | |
| Mar 29, 2020 at 17:57 | history | edited | Tim | CC BY-SA 4.0 |
added 1 character in body
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| Mar 29, 2020 at 17:27 | vote | accept | Tim | ||
| Mar 29, 2020 at 17:23 | history | edited | Tim | CC BY-SA 4.0 |
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| Mar 29, 2020 at 17:02 | answer | added | Célio Augusto | timeline score: 1 | |
| Mar 29, 2020 at 16:51 | answer | added | William M. | timeline score: 0 | |
| Mar 29, 2020 at 16:42 | history | asked | Tim | CC BY-SA 4.0 |