Of all the weld failures in a certain assembly 85 of them, Microeconomics

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Of all the weld failures in a certain assembly 85 of them

1. 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 is the probability that exactly five of them are base metal failures?

b. What is the probability that fewer than four of them are base metal failures?

c. What is the probability that none of them are base metal failures?

d. Find the mean number of base metal failures.

e. Find the standard deviation of the number of base metal failures.

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Microeconomics: Of all the weld failures in a certain assembly 85 of them

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