Question 344439
Let U=under age 24
let O=over age 24
given 
P(U)=0.65, therefore P(O)=1-P(U)=1-0.65=0.35
--
if 5 students are selected

P(all 5 are 24 or older)=P(OOOOO)=P(O)*P(O)*P(O)*P(O)*P(O) if we assume independence.
={{{0.35^5=0.005252}}}