15% of the vehicles have a navigation system. Assuming binomial distribution, what is the expected number and standard deviation of the number of vehicles with navigation system in a random sample of 18 vehicles? E(x)=15.3 o (x)=1.515 OE(x)=2.7 o (x)=1.515 E(x)= 2.7 o (x)=2.295 E(x)=15.3 O (x)=2.295