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.What is the probability that exactly five of the mare base metal failures? What is the probability that fewer than four of them are base metal failures? What is the probability that none of the mare base metal failures? Find the mean number of base metal failures. Find the standard deviation of the number of base metal failures.

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Answered: Of all the weld failures in a certain…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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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.

What is the probability that exactly five of the mare base metal failures?  
What is the probability that fewer than four of them are base metal failures?  
What is the probability that none of the mare base metal failures?  
Find the mean number of base metal failures. 
Find the standard deviation of the number of base metal failures.

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