Sami Wilson Believes That Number of Cars Arriving at His $\alpha$

Multiple Choice

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: Using $\alpha$ = 0.05, the critical value of chi-square for this goodness-of-fit test is ___.

A) 9.49
B) 7.81
C) 7.78
D) 11.07
E) 12.77