9. The number N of queries arriving in t seconds at a call center is a Poisson random variable with parameter Åt where is the average arrival rate in queries/second. Assume that the arrival rate is four queries per minute. Find the probability that there are fewer than 5 queries in 2 minutes.

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A:

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A: Non drinkerRegular drinkeeHeavy drinkerTotalMale 135635203Female1872111219Total3228416422

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A: Sample size n=3878Favorable cases x=3241

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A: n=5,α=0.01

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A:

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A: From table Total = 700Medium = 200Not medium = 700 - 200 = 500

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A: 19.3,20.7,20.5,21.5,20.9,19.3