A landscaper must plant one flower, one grass, and one
 tree at each job site. She has 6 different kinds of flowers,
 4 different kinds of grasses, and 9 different kinds of trees
 from which to choose. Find the probability that the job
 site owner correctly guesses the correct plants on the
 finished job site. (Express your answer as a decimal
 rounded to the nearest ten-thousandth.)