Question 11

Scenario: A mail-order company business has six telephone lines. Let  denote the number of lines in use at a specified time.

Probabilities:

  • .
  • .
  • .
  • .
  • .
  • .
  • .

(a)

Problem: What is the probability that at most three lines are in use?

Process: ...
Answer: 0.72.

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