# The probability of another individual event is 1 15

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The probability of another individual event is 1 15 . The probability of an individual event where D is ranked first is 1
12 . The probability of another individual event is 1 4 . (b) What is the probability that C is ranked first? (Round your answer to three decimal places.) 3 (c) What is the probability that
C is ranked first and D is ranked last? (Round your answer to three decimal places.) 4 0 Your work in question(s) will also be submitted or saved. Viewing Saved Work Revert to Last Response 4. –/1 points DevoreStat9 2.E.502.XP. Ask Your Teacher
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0/5 Total –/1 A box contains six 40-W bulbs, four 60-W bulbs, and eight 75-W bulbs. If bulbs are selected one by one in random order, what is the probability that at least two bulbs must be selected to obtain one that is rated 75 W? (Round your answer to three decimal places.) 1 0 Your work in question(s) will also be submitted or saved.
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–/2 Human visual inspection of solder joints on printed circuit boards can be very subjective. Part of the problem stems from the numerous types of solder defects (e.g., pad non-wetting, knee visibility, voids) and even the degree to which a joint possesses one or more of these defects. Consequently, even highly trained inspectors can disagree on the disposition of a particular joint. In one batch of 10,000 joints, inspector A found 720 that were judged defective, inspector B found 756 such joints, and 1328 of the joints were judged defective by at least one of the inspectors. Suppose that one of the 10,000 joints is randomly selected. (a) What is the probability that the selected joint was judged to be defective by neither of the two inspectors? (Enter your answer to four decimal places.) 1 (b) What is the probability that the selected joint was judged to be defective by inspector B but not by inspector A? (Enter your answer to four decimal places.) 2
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–/1 0/5 0/5 0/5 Total –/3 A certain factory operates three different shifts. Over the last year, 200 accidents have occurred at the factory. Some of these can be attributed at least in part to unsafe working conditions, whereas the others are unrelated to working conditions. The accompanying table gives the percentage of accidents falling in each type of accident-shift category.
Unsafe Conditions Unrelated to Conditions Day 13% 32% Shift Swing 9%
13% Night 2% 31% Suppose one of the 200 accident reports is randomly selected from a file of reports, and the shift and type of accident are determined.