The Owner of a Car Wash Wants to See If

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: ​ The calculated value for the test statistic equals

A) 3.11.
B) .18.
C) 1.72.
D) 2.89.