Suppose an assembly line is able to manufacture 3000 chips per day. The probability that a chip meets the standard is independently 1/1000. An assembly line is qualified if it is able to produce at least 3 standard chips per day. (a) Write down the exact expression of the probability that this assembly line is qualified if it operates only one day. (b) Write down a relevant approximate expression for the probability from (a).
Suppose the assembly line company decides to manufacture more chips in a day in order to produce sufficient qualified chips per day with high probability. Specifically, the CEO wants to get at least 3 qualified chips per day with probability at least 0.999. How many assembly lines should the company purchase in total? (You might need wolframalpha.com or other devices to solve an equation.)
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