P{X<3.5}=Φ((3.5-1.5)/√4=Φ(1)=0.8413P{|X-3|>3.5}=1-P{|X-3|≤3.5}=1-P{-0.5≤X≤6.5}=1-(Φ((6.5-1.5)/√4)-Φ((-0.5-1.5)/√4))=1-(Φ(2.5)-Φ(-1))=1-(Φ(2.5)-(1-Φ(1)))=1-Φ(2.5)＋1-Φ(1)
