Does expected value of square of a random variable always exist?
11727
How can a distribution have infinite mean and variance?
48525
Does $r$-squared have a $p$-value?
101828
Expected value as a function of quantiles?
14063
Is a non-negative random variable with zero mean almost surely zero?
156092
Existence of independent and identically distributed random variables.
89544
Expectation of a random variable that takes points in the natural numbers
66628
Expected value of $X^n$ for normal distribution
22085
Expectation of a function of a random variable from CDF
115338
Example: satisfying $E(X_{n+1}\mid X_n)=X_n$ but not a martingale
156019
Expectation formula of an integrable random variable
132920
Help with proof that the expected value of $x_i$ is $\bar{X}$
86729
Are squares of independent random variables independent?
93460
WLLN: can expectation exist but be infinite?
5207
Toss a fair die until the cumulative sum is a perfect square-Expected Value
35277
Why is $\mathbb{E}[X] = 1 + \sum^\infty_{k=1}\mathbb{P}(X > k)$ true?
118195
How does one prove that $e$ exists?
3950
Expected Value of Max of IID Variables