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A manager at a brokerage firm notices that some of his stockbrokers follow the company's suggestions based on research while others tend to operate on more of a "gut feeling" and make their own calls. Using the data in the chart, find the following probabilities.


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1. P(a stockbroker picked stocks that went up)

2. P(a stockbroker did not pick stocks that went up)

3. P(a stockbroker used research)

4. P(a stockbroker didn't use research)


What if the manager wants to compare the success of his brokers who are using research to those that are not?

5. P(a stockbroker who used research

6. P (a stockbroker who didn't use research picked stocks that went up) picked stocks that went up)

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