The times (in seconds) taken by 150 athletes to run a 110m hurdle race are tabulated below

The number of athletes who completed the race in less than 14.6 s is

For the following distribution,

the modal class is

Consider the data

The difference of the upper limit of the median class and the lower limit of the modal class is

Consider the following distribution

The frequency of the class 30 - 40 is

If an event cannot occur, then its probability is