a)
i) Two events are said to be independent if the occurrence (or non-occurrence) of one will not in any way affect the occurrence (or non-occurrence) of the other. Two events are dependent if the occurrence (or non-occurrence) of one will affect the occurrence (or non-occurrence) of the other. (2 marks)

ii) Two events are mutually exclusive if both events cannot occur together in a random experiment. They are said to be exhaustive events if they are complementary events. (2 marks)

iii) The joint probability of two events is the probability that both events will occur together in an experiment. The probability of having one of the two events is termed the marginal probability of the event. (2 marks)