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If customers arrive at a single drive-in window at a local bank one every four minutes on the average, and if you can serve a customer in three minutes on the average:

What is the probability that four or more cars will be in the drive-in facility?

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Solution describes the steps to calculate the desired probability value in the given case.

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Please refer attached file for missing expressions.

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  • BEng (Hons) , Birla Institute of Technology and Science, India
  • MSc (Hons) , Birla Institute of Technology and Science, India
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