Consider the probability distribution function defined as
\({f_x}\left( x \right) = \left\{ {\begin{array}{*{20}{c}} {\left| x \right|,\;\left| x \right| < 1}\\ {0,\;otherwise} \end{array}} \right.\)
Which of the following is true regarding this function?
1
This is a valid PDF
2
Invalid PDF
3
f (x) < 0 for some values of x
4
Insufficient data