Sami Wilson Believes That Number of Cars Arriving at His

Sami Wilson believes that number of cars arriving at his Spotless Car Wash follow a Poisson distribution.He collected a random sample and constructed the following frequency distribution to test his hypothesis: The number of degrees of freedom for this goodness-of-fit test is ___.

A) 5
B) 4
C) 3
D) 2
E) 1