posted by sophia .
Given the ensuing well drilling data, answer the following.
• .30 (30%) probability of a productive well absent test information
• Pre-drilling ballistics test ‘s affirmative result correctly predicts a productive well .70 of the time
• Pre-drilling ballistics test’s negative result correctly predicts a non-productive well .80 of the time
9.1 Probability of a productive well given an affirmative ballistics test
9.2 Probability of a non-productive well given a negative ballistics test