Question: Provided that X is a continuous random variable and FX is well behaved in (5.21), we can take fX (x) = d dx
Provided that X is a continuous random variable and FX is well behaved in (5.21), we can take fX (x) =
d dx FX (x) if this derivative exists at x, 0 otherwise,
(5.23)
as the density function of X.We shall normally do this, although we should point out that there are some difficulties overmathematical rigour here. However, for almost all practical purposes
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