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 observed value of chi-square for this goodness-of-fit test is ___.

A) 0.73
B) 6.72
C) 3.15
D) 7.81
E) 9.87