Of all the weld failures in a certain assembly, 85% of them occur in the weld metal itself, and the remaining 15% occur in the base metal. A sample of 20 weld failures is examined. a) What sampling technique would you recommend for the above experiment and explain why? b) What is the probability that exactly five of them are base metal failures? c) Which model best fit the above problem and explain why?

A First Course in Probability (10th Edition)
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Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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Of all the weld failures in a certain assembly, 85% of them occur in the weld
metal itself, and the remaining 15% occur in the base metal. A sample of 20
weld failures is examined.
a) What sampling technique would you recommend for the above experiment
and explain why?
b) What is the probability that exactly five of them are base metal failures?
c) Which model best fit the above problem and explain why?

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