Sami Schmitt Believes That Number of Cars Arriving at His

Sami Schmitt believes that number of cars arriving at his Scrub and Shine 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