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Vehicles carrying Occupy Durham protesters arrive at rate 30 per hour. • 50 % are bicycles…

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Vehicles carrying Occupy Durham protesters arrive at rate 30 per hour.

• 50 % are bicycles carrying one person

• 30 % are BMW’s carrying two people

• 20 % are Prius’s carrying four happy carpoolers (a) What is the probability exactly 4 Prius’s arrive between 12 and 12:30? (b) Find the mean and standard deviation of the number of people which arrive in that half hour.