2. Subscribers to a local newspaper were asked whether they regularly, occasionally, or never read the business section and also whether they had traded common stocks over the last year. The following table indicates the proportions of subscribers in six joint classifications. Traded Stocks Yes No Read Business section Regularly Occasionally Never 0.18 0.04 0.16 0.31 0.21 (a) What is the probability that a randomly chosen subscriber never reads the business sec- tion? (a) 25% (b) What is the probability that a randomly chosen subscriber has traded stocks over the last year? (b) 32% (c) What is the probability that a randomly chosen subscriber traded stocks and never read the business section? (c) 4% (d) What is the probability that a subscriber traded stocks, if he never read the bussiness section? (d) 16% (e) What is the probability that a subscriber never reads the business section, if the traded stocks? (e) 12.5%
2. Subscribers to a local newspaper were asked whether they regularly, occasionally, or never read the business section and also whether they had traded common stocks over the last year. The following table indicates the proportions of subscribers in six joint classifications. Traded Stocks Yes No Read Business section Regularly Occasionally Never 0.18 0.04 0.16 0.31 0.21 (a) What is the probability that a randomly chosen subscriber never reads the business sec- tion? (a) 25% (b) What is the probability that a randomly chosen subscriber has traded stocks over the last year? (b) 32% (c) What is the probability that a randomly chosen subscriber traded stocks and never read the business section? (c) 4% (d) What is the probability that a subscriber traded stocks, if he never read the bussiness section? (d) 16% (e) What is the probability that a subscriber never reads the business section, if the traded stocks? (e) 12.5%
Chapter8: Sequences, Series,and Probability
Section8.7: Probability
Problem 11ECP: A manufacturer has determined that a machine averages one faulty unit for every 500 it produces....
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Transcribed Image Text:2. Subscribers to a local newspaper were asked whether they regularly, occasionally, or never read
the business section and also whether they had traded common stocks over the last year. The
following table indicates the proportions of subscribers in six joint classifications.
Traded Stocks
Yes
No
Read Business section
Regularly Occasionally Never
0.18
0.04
0.16
0.31
0.21
(a) What is the probability that a randomly chosen subscriber never reads the business sec-
tion?
(a)
25%
(b) What is the probability that a randomly chosen subscriber has traded stocks over the last
year?
(b)
32%
(c) What is the probability that a randomly chosen subscriber traded stocks and never read
the business section?
(c)
4%
(d) What is the probability that a subscriber traded stocks, if he never read the bussiness
section?
(d)
16%
(e) What is the probability that a subscriber never reads the business section, if the traded
stocks?
(e)
12.5%
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