The Owner of a Car Wash Wants to See If

question 20

Multiple Choice

The owner of a car wash wants to see if the arrival rate of cars follows a Poisson distribution. In order to test the assumption of a Poisson distribution, a random sample of 150 ten-minute intervals was taken. You are given the following observed frequencies: ​ Calculate mean and use Poisson probabilities. The expected frequency of exactly 3 cars arriving in a 10-minute interval is

• A) .1533.
• B) .1743.
• C) 23.
• D) 26.145.

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