Question -
Answer -
The total number of trials is 30.
Remember the empirical or experimental or observed frequency approach to probability.
If n be the total number of trials of an experiment and A is an event associated to it such that A happens in m-trials. Then the empirical probability of happening of event A is denoted by
and is given by (i) Let A be the event of hitting boundary.
The number of times A happens is 6.
Therefore, we have
(ii) Let B be the event of does not hitting boundary.
The number of times B happens is 
. Therefore, we have