Question

If x uniform distribution over (-5,9) find p(x>3) ​

Answer 1

$X$ has PDF

$f_X(x)=\begin{cases}\dfrac1{14}&\text{for }-5$

so that

$P(X>3)=\displaystyle\int_3^\infty f_X(x)\,\mathrm dx=\frac1{14}\int_3^9\mathrm dx=\frac37$