The function ff is a probability density function for the random variable XX defined on the given interval. Find the indicated probabilities. $($Round your answers to three decimal places.$)$

f$($x$)=12$e$$x$/2$;$0$x$<$f$($x$)=12$e$$x$/2$;$0$x$<$

$($a$)$

P$($X$2)$