Answer
(a) $P(X\leq4)=0.9$
(b) $P(X\gt7)=0$
(c) $P(X\leq5)=0.9$
(d) $P( X\gt4)=0.1$
(e) $P(X\leq2)=0.7$
Work Step by Step
(a) $P(X\leq4)=F(4)=0.9$
(b) $P(X\gt7)=1-F(7)=1-1=0$
(c) $P(X\leq5)=F(5)=0.9$
(d) $P( X\gt4)=1-F(4)=1-0.9=0.1$
(e) $P(X\leq2)=F(2)=0.7$
