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Facebook reports that 70% of their users are from outside the United States and that 50% of their users log on to Facebook every day. Suppose that 20% of their users are United States users who log on every day.
a) What percentage of Facebook's users are from the United States?
b) What type of probability is the 20% mentioned above?
c) Construct a contingency table showing all the joint and marginal probabilities.
d) What is the probability that a user is from the United States given that he or she logs on every day?
e) Are From United States and Log on Every Day indepen- dent? Explain.
The winning team's scores in 7 high school basketball games were recorded. If the sample mean is 10.3 points and the sample standard deviation is 0.10 points,
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annual starting salaries for college graduates with degrees in business adminstration are generally expected to be
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What is the probability that no customers arrive between 8:30 A.M. and 9:30 A.M. on Monday morning? What is the expected number of arrivals in this period?
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