Why variance in probability is taken as E[(X−E[X])2]?
85588
How variance is defined?
99062
Intuitive explanation of variance and moment in Probability
25605
Why does the median minimize $E(|X-c|)$?
68116
How to derive this version of variance formula
109109
Show that $E(XE[X|G])=E[(E[X|G)^2]$
45143
Identify $E(X\mid X+Y)$ for $X$ and $Y$ independent and Poisson
132392
Properties of Expectation
5350
Explain why $E(|X|^p)=p\int_{0}^{\infty}y^{p-1}P(|X|>y) dy$
53109
Why is this limit $\lim_{n \to \infty}(1 + \frac{1}{n})^n$ equal to $e$?
80801
Why does the variance of the Random walk increase?
85818
$E(|X-Y|)$ for $X$, $Y$ i.i.d and uniform on $[0,1]$
89544
Expectation of a random variable that takes points in the natural numbers
141861
What is meant by the variance of *functions* in *Introduction to Statistical Learning*?
120719
Why isn't it $E \approx 27.642 \times mc^2$?
74054
Conditional expectation for a sum of iid random variables: $E(\xi\mid\xi+\eta)=E(\eta\mid\xi+\eta)=\frac{\xi+\eta}{2}$
94136
Why is variance squared?
1094
Expected Value of the maximum of two exponentially distributed random variables