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Scrap rate of machine parts. A press produces parts used
Chapter 3, Problem 125SE(choose chapter or problem)
Problem 125SE
Scrap rate of machine parts. A press produces parts used in the manufacture of large-screen plasma televisions. If the press is correctly adjusted, it produces parts with a scrap rate of 5%. If it is not adjusted correctly, it produces scrap at a 50% rate. From past company records, the machine is known to be correctly adjusted 90% of the time. A quality-control inspector randomly selects one part from those recently produced by the press and discovers it is defective. What is the probability that the machine is incorrectly adjusted?
Questions & Answers
QUESTION:
Problem 125SE
Scrap rate of machine parts. A press produces parts used in the manufacture of large-screen plasma televisions. If the press is correctly adjusted, it produces parts with a scrap rate of 5%. If it is not adjusted correctly, it produces scrap at a 50% rate. From past company records, the machine is known to be correctly adjusted 90% of the time. A quality-control inspector randomly selects one part from those recently produced by the press and discovers it is defective. What is the probability that the machine is incorrectly adjusted?
ANSWER:
Solution:
Step 1 of 2:
Given a press produces parts used in the manufacture of large- screen plasma televisions.
If the press is correctly adjusted, a scrap rate is 5%
If the press is not adjusted correctly, a scrape rate is 50%.
From past company records, the machine is correctly adjusted 90% of the time.
Let A = press is correctly adjusted.
B = press is incorrectly adjusted.
D = part is defective.