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Chapter 13: Q. 4 (page 864)
True or False In a probability model, the sum of all probabilities is 1.
True statement
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The U.S. Senate has 100 members. Suppose that it is desired to place each senator on exactly 1 of 7 possible committees. The first committee has 22 members, the second has 13, the third has 10, the fourth has 5, the fifth has 16, and the sixth and seventh have 17 apiece. In how many ways can these committees be formed?
In Problems 17鈥�22, use the following spinners to construct a probability model for each experiment.
Spin spinner I twice, then spinner II. What is the probability of getting a 2, followed by a 2 or a 4, followed by Red or Green?
Forming Codes How many two-letter codes can be formed using the letter A, B, C, and D? Repeated letters are allowed.
List all the combinations of 6 objects 1, 2, 3, 4, 5, and 6 taken 3 at a time. What is ?
Analyzing Survey Data In a survey of 100 investors in the
stock market,
50 owned shares in IBM
40 owned shares in AT&T
45 owned shares in GE
20 owned shares in both IBM and GE
15 owned shares in both AT&T and GE
20 owned shares in both IBM and AT&T
5 owned shares in all three
(a) How many of the investors surveyed did not have shares
in any of the three companies?
(b) How many owned just IBM shares?
(c) How many owned just GE shares?
(d) How many owned neither IBM nor GE?
(e) How many owned either IBM or AT&T but no GE?
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