Question

Facebook reports that 68% of their users are from outside the United States and that 45% of their users log on to Facebook every day. Suppose that 27% of their users are United State users who log on every day.

1. (3pts) What’s the probability that a randomly selected Facebook user is from outside the United States but he/she doesn’t logs on to Facebook every day?

2. (3pts) What’s the probability that a randomly selected Facebook user is from outside the United States or he/she logs on to Facebook every day (or both)?

3. (3pts) What’s the probability that a randomly selected Facebook user is not from outside the United States and he/she doesn’t logs on to Facebook every day?

4. (3pts) What is the probability that a randomly Facebook user is from the United States given that he or she logs on to Facebook every day?

5. (3pts) Are From United States and Log on Facebook Every Day independent? Explain it by using the probability concept.

6. (3pts) Are From United States and Log on to Facebook Every Day mutually exclusive (dis- joint)? Explain it by using the probability concept.

Answer 1

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