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[Core] 有冇人識做求救 Probability

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有冇人識做求救 Probability

      a  Among the 18 districts in Hong Kong, four, five and nine are located in Hong Kong Island, Kowloon and the New Territories respectively. Suppose that six districts are to be randomly selected.

      i  If the selection is with replacement, what is the probability that exactly three of them will be
      from Hong Kong Island’s? (4 marks)

      ii  If the selection is without replacement, what is the probability that exactly three of them will be from Hong Kong Island’s? (3 marks)

      b  Suppose that phone calls coming in to the enquiry hotline of a telecommunication corporation follow a Poisson distribution with an average rate of two calls per minute. What is the probability that:

      i  exactly three calls will come in during a particular one-minute interval? (4 marks)

      ii  more than one call will come in during a particular one and a half minute interval?
      (5 marks)
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[ 本帖最後由 Chrisssssssssss 於 2017-10-6 12:02 PM 編輯 ]
   

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