Three machines A,B,C produce 20%,30%,50% of items respectively. If defect rates are 2%,3%,4%, probability that a randomly selected item is defective is:
Three machines A,B,C produce 20%,30%,50% of items respectively. If defect rates are 2%,3%,4%, probability that a randomly selected item is defective is:
- A. 0.033
- B. 0.03
- C. 0.04
- D. 0.05
Answer: A) 0.033
Explanation: 0.2×0.02+0.3×0.03+0.5×0.04=0.033.
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