Question

Find the indicated probability.

The table below describes the smoking habits of a group of asthma sufferers.

		Light	Heavy
	Nonsmoker	Smoker	Smoker	Total
Men	402	35	42	479
Women	376	45	33	454
Total	778	80	75	933

Answer 1

There is no probability indicated to be found. Anyways, I am giving you the idea of how to calculate any probability for an event as indicated.

probability = number of favourable outcomes / total outcomes

So, let say you are asked to find probability of a men who is light smoker, then it will be = 35 / 933 (see the table)

you may also be asked to find probabaility a person is light smoker given that he is a man (conditional probability) , then it will be = 35 / 479

Similarly we can find lot of probabilities for different cases.