1. ## Probability!

Need some help on this one, i get confused with the second one especially. i have the first and the 3rd one worked out!

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

Light Heavy
Non-Smoker Smoker Smoker Total__
Men 432 35 31 498
Women 438 39 43 520
Total 870 74 74 1018

a. If a person is randomly selected, find the probability that he or she is not a light smoker.
b. If a person is randomly selected, find the probability of getting a woman given that she is a nonsmoker.
c. Assuming we were to consider a random sample of 13,000 people, how many would you predict are men who are heavy smokers based on the results given here?

2. Think about probability as (size of group satisfying the condition) divided by ( total size of group).

So for the first problem it is:
(total number of non-light smokers) / (total number of people).

The second problem is conditional probability: Imagine I select a person at random and don't show you who they are. All I tell you is that the person selected is a nonsmoker. Now tell me how likely it is that they are a woman?

For the last problem assume that the sample group represents the actual population's proportions of smokers to non-smokers, heavy to light, etc. So what percentage of the total sample are male heavy smokers? What number of people is this percentage of 13,000?