Timeline for Finding the expected value and variance of $X$
Current License: CC BY-SA 3.0
7 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Aug 8, 2015 at 22:30 | vote | accept | 3SAT | ||
| Aug 3, 2015 at 21:33 | history | edited | 3SAT | CC BY-SA 3.0 | edited body |
| Aug 3, 2015 at 21:33 | answer | added | 3SAT | timeline score: 0 | |
| Aug 3, 2015 at 20:54 | comment | added | jameselmore | You do the exact same thing as you did for $E[X]$, but the integrand is $t^2\cdot f_X(t)$, instead of $t\cdot f_X(t)$. | |
| Aug 3, 2015 at 20:52 | comment | added | 3SAT | @jameselmore Your hint is correct but I don't know how to use it | |
| Aug 3, 2015 at 18:33 | comment | added | jameselmore | Hint: $$E\big[g(X)\big] = \int_{-\infty}^{\infty} g(x)\cdot f(x) \ dx$$ | |
| Aug 3, 2015 at 18:31 | history | asked | 3SAT | CC BY-SA 3.0 |