Question

The following is the c.d.f. of a discrete r.v. X:

X	$-3$	$-1$	$0$	$1$	$3$	$5$	$7$	$9$
$F\left(x\right)$	$0.1$	$0.3$	$0.5$	$0.65$	$0.75$	$0.85$	$0.90$	$1$

Find $P(X\ge 5)$.

Answer 1

$P(X\ge 5)=1-P(X<5)$

$=1-0.75$

$=0.25$

Hence, the answer is $\mathrm{0.25.}$