SOLUTION: In a certain firm, the defective products will be checked to. Past experience shows that 25% of products are defective after checked. Twenty defective products are found after a lo

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Question 363825: In a certain firm, the defective products will be checked to. Past experience shows that 25% of products are defective after checked. Twenty defective products are found after a long working day.
a. What is the probability that all the defective products can be reworked?
b. What is the probability that at least 18 defective ones can be reworked?

Answer by stanbon(75887) About Me  (Show Source):
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In a certain firm, the defective products will be checked to. Past experience shows that 25% of products are defective after checked. Twenty defective products are found after a long working day.
a. What is the probability that all the defective products can be reworked?
b. What is the probability that at least 18 defective ones can be reworked?