150 pupils in a sports centre are surveyed.
The pupils can only use the swimming pool, the gym and the tennis courts.

30 pupils use the swimming pool, the gym and the tennis courts.
43 pupils use the swimming pool and the gym.
40 pupils use the gym and the tennis courts.
49 pupils use the tennis courts and the swimming pool.
71 pupils use the swimming pool.
78 pupils use the gym.
92 pupils use the tennis courts.

Find the probability to select a pupil that uses the tennis courts only.