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b) The average number of persons entering a hospital casualty ward per hour is 9. Assume the distribution of hospital casualty ward entries per hour

b) The average number of persons entering a hospital casualty ward per hour is 9. Assume the distribution of hospital casualty ward entries per hour can be approximated by the Poisson probability distribution. What is the probability at most 4 people will enter the hospital casualty ward in the next half an hour?

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