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Jan
24
comment Is the expected value of the difference of these two random variables, with infinite expected value, $0$, or undefined?
The linearity of expectation relies on both expectations being finite. Surely you would agree that the expectation of $x_1-x_1$ is 0, for example.
Sep
24
awarded  Autobiographer
Mar
5
comment Prove for which $n \in \mathbb{N}$: $9n^3 - 3 ≤ 8^n$
I knew it didn't hold for $n=2$, but I didn't want to do the whole homework problem!
Mar
5
awarded  Supporter
Oct
15
awarded  Teacher
Oct
15
answered Prove for which $n \in \mathbb{N}$: $9n^3 - 3 ≤ 8^n$