statistics
posted by sophia .
Given the ensuing well drilling data, answer the following. [Reference: #4.78, page 172]
• .30 (30%) probability of a productive well absent test information
• Predrilling ballistics test ‘s affirmative result correctly predicts a productive well .70 of the time
• Predrilling ballistics test’s negative result correctly predicts a nonproductive well .80 of the time

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