Basic probability - set theory.
The following table, compiled in 2004, gives the percent of music downloaded from the United States and other countries by U.S. users.
|
Country
|
U.S.
|
Germany
|
Canada
|
Italy
|
U.K.
|
France
|
Japan
|
Other
|
|
Percent
|
45.1
|
16.1
|
6.5
|
5.6
|
4.1
|
3.7
|
2.4
|
16.5
|
(a) Verify that the table does give a probability distribution for the experiment.
The sum of the percents is %, so this does give the probability distribution.
(b) What is the probability that a U.S. user who downloads music, selected at random, obtained it from either the United States or Canada?
(c) What is the probability that a U.S. user who downloads music, selected at random, does not obtain it from Italy, the United Kingdom (U.K.), or France?