4 Trees in the Redian forest are classified as tall, medium or short, according to their height. The heights can be modelled by a normal distribution with mean 40 m and standard deviation 12 m . Trees with a height of less than 25 m are classified as short.
- Find the probability that a randomly chosen tree is classified as short.
Of the trees that are classified as tall or medium, one third are tall and two thirds are medium. - Show that the probability that a randomly chosen tree is classified as tall is 0.298 , correct to 3 decimal places.
- Find the height above which trees are classified as tall.