Probability Rules
There are two rules which are very important.
- All probabilities are between 0 and 1 inclusive 0 <= P(E) <= 1
- The sum of all the probabilities in the sample space is 1
- There are some other rules which are also important.
- The probability of an event which cannot occur is 0.
- The probability of any event which is not in the sample space is zero.
- The probability of an event which must occur is 1.
- The probability of the sample space is 1.
- The probability of an event not occurring is one minus the probability of it occurring.
P(E') = 1 - P(E)
