# Question: Based on analysis of data from last year you have

Based on analysis of data from last year, you have found that 40% of the people who came to your store had not been there before. While some just came to browse, 30% of people who came to your store actually bought something. However, of the people who had not been there before, only 20%bought something. You are thinking about these percentages as probabilities representing what will happen each time a person comes to your store.

a. What kind of probability numbers are these, in terms of where they come from?

b. Draw a probability tree for this situation.

c. Find the probability that a person coming to your store will have been there before and will make a purchase.

d. What is the probability that a customer had been there before given that the customer did not purchase anything during his or her visit?

a. What kind of probability numbers are these, in terms of where they come from?

b. Draw a probability tree for this situation.

c. Find the probability that a person coming to your store will have been there before and will make a purchase.

d. What is the probability that a customer had been there before given that the customer did not purchase anything during his or her visit?

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