Exercise 2: Suppose a customer service representative (CSR) supervisor believes random arrivals at a local bank are Poisson distributed and sets out to test this hypoth- esis by gathering information. The following data represent a distribution of frequency of arrivals during one-minute intervals at the bank. Use a = 0.05 to test these data in an effort to determine whether they are Poisson distributed. Observed Frequencies Number of Arrivals 0 7 18 25 3 17 12 du 4 5 20 5