A First Course in Probability (10th Edition)
10th Edition
ISBN: 9780134753119
Author: Sheldon Ross
Publisher: PEARSON
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A scientist is studying the relationship between stomach aches and headaches among students. On her survey, she asked if the participant had headaches that could be classified as “sudden,” “chronic,” or “none.” The survey also asked if the participant had stomach aches with answers of “yes” or “no.” From the survey she found:
- 14% have sudden headaches;
- 22% have chronic headaches;
- 15% have stomach aches;
- Of those with stomach aches, 1⁄3 have sudden headaches.
- Of those with no headaches, 1⁄8 have stomach aches.
What is the
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Step 1
Given that headaches could be classified as "sudden", "chronic", or "none". The survey also asked if the participant had stomach aches with answers of "yes" or "no".
From the survey she found:
- 14% have sudden headaches;
- 22% have chronic headaches;
- 15% have stomach aches;
- Of those with stomach aches, 1⁄3 have sudden headaches.
- Of those with no headaches, 1⁄8 have stomach aches.
So,
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