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A distribution function $F_X(x)$ (Функция распределения)
$0 \leqslant F(x) \leqslant 1$
$F_X(x)$ - monotonic non-increasing function (неубывающая)
if $\text{Dom}(X) = (a, b)$ (continuous)
A density of $F_X(x)$ is a function $f_X(x)$ s.t.
The probability that $X$ will take some value from interval $(a, b)$
The cumulate distribution function $F_X(x)$ can be found by taking an integral of $f_X(x)$