Consider the following distribution

The frequency of the class 30 - 40 is

Consider the data

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

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

If an event cannot occur, then its probability is

Which of the following cannot be the probability of an event?