One fifth percent of the blades produced by a blade manufacturing fact...
Calculating the Number of Packets Containing Defective Blades
1) Number of Packets with no Defective Blades
- The probability of a blade being defective is 1/5 percent, which is equivalent to 0.2%.
- Therefore, the probability of a blade not being defective is 1 - 0.2% = 99.8%.
- Since each packet contains 10 blades, the probability of a packet containing no defective blades is (0.998)^10 = 0.8187.
- To calculate the number of packets with no defective blades in a consignment of 10000, we use the Poisson distribution formula: P(X = k) = (e^(-λ)*λ^k) / k!, where λ = n*p, n = 10000 packets, p = 0.8187, and k = 0 (no defective blades).
- Plugging in the values, we get P(X = 0) = (e^(-10000*0.8187)*(10000*0.8187^0)) / 0! = 0.000045.
2) Number of Packets with One Defective Blade
- The probability of a packet containing one defective blade is 10 * 0.2% * (0.998)^9 ≈ 0.002.
- Using the Poisson distribution formula with λ = n*p, n = 10000 packets, p = 0.002, and k = 1 (one defective blade), we get P(X = 1) = (e^(-10000*0.002)*(10000*0.002^1)) / 1! = 0.0366.
Therefore, approximately 0.000045 packets will contain no defective blades, and 0.0366 packets will contain one defective blade in a consignment of 10000 packets.
To make sure you are not studying endlessly, EduRev has designed UPSC study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in UPSC.