Cross Validated Asked on December 25, 2021
If the joint density $f_{X_1,…,X_n}(x_1,…,x_n)$ is symmetric about the origin in the sense that for any $(x_1,…,x_n)$, it holds that
$f_{X_1,…,X_n}(x_1,…,x_n)=f_{X_1,…,X_n}(-x_1,…,-x_n)$
, does this imply that each marginal cdf satisfy $F_{X_i}(0)=1/2$?
Intuitively this seems true, as each marginal density will also be symmetric about the origin, which implies $F_{X_i}(0)=1/2$.
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