posted by Josh .
On a certain road 20% of the vehicles are trucks, 16% are buses and the remainder are cars.
(i) A random sample of 11 vehicles is taken. Find the probability that fewer than 3 are buses. 
(ii) A random sample of 125 vehicles is now taken. Using a suitable approximation, find the
probability that more than 73 are cars.
A truck driver estimates that a country road rises 40 cm for every 6 m along the road. What is the angle of inclination of the road?