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    Probability problems regarding Facebook

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    Facebook reports that 70% of their users are from outside the United States and that 50% of their users log onto the Facebook everyday. Suppose that 20% of their users are United States users who log on every day.

    1. What percentage of Facebook users are from the United States?
    2. What type of probability is the 20% mentioned above?
    3. Construct a contingency table showing all the joint and marginal probabilities.
    4. What is the probability that a user is from the united states given that he or she logs on evry day?
    5. Are "From the United States" and "Log on every day" independent?

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    Solution Summary

    This solution demonstrates how to solve probability problems related to Facebook.