4L A machine produces bolts, and for each bolt there is a probability p of it being defective, results for different bolts being independent. A large batch of the machine's production is inspected by a customer in order to determine whether the batch should be purchased. In the inspection, 10 bolts are selected at random and examined: if none is defective the batch is accepted, and if three or more are defective it is rejected. If only one or two are defective, a further sample of 10 is selected, and the batch is accepted if, in total, there are no more than two defectives. (a) What is the probability of a decision being made at the first stage? (b) Find the probability that the batch is accepted (i) if p=0.05, (ii) if p=0.15.

MATLAB: An Introduction with Applications
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A machine produces bolts, and for each bolt there is a probability p of it being defective,
results for different bolts being independent. A large batch of the machine's production is
inspected by a customer in order to determine whether the batch should be purchased. In the
inspection, 10 bolts are selected at random and examined: if none is defective the batch is
accepted, and if three or more are defective it is rejected. If only one or two are defective, a
further sample of 10 is selected, and the batch is accepted if, in total, there are no more than
two defectives.
(a) What is the probability of a decision being made at the first stage?
(b) Find the probability that the batch is accepted (i) if p=0.05, (ii) if p=0.15.
Transcribed Image Text:4[ A machine produces bolts, and for each bolt there is a probability p of it being defective, results for different bolts being independent. A large batch of the machine's production is inspected by a customer in order to determine whether the batch should be purchased. In the inspection, 10 bolts are selected at random and examined: if none is defective the batch is accepted, and if three or more are defective it is rejected. If only one or two are defective, a further sample of 10 is selected, and the batch is accepted if, in total, there are no more than two defectives. (a) What is the probability of a decision being made at the first stage? (b) Find the probability that the batch is accepted (i) if p=0.05, (ii) if p=0.15.
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