10.80 The data in the following table show the frequency counts for 400 observations on the number of bacterial colonies within the field of a microscope, using samples of milk film.

(Bliss and Owens, Biometrics, 1953.) Test the hypothesis that the data come from a Poisson distribution. Use 0.05.

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Number of Colonies per Field 0 Frequency of Observations 56 1234567 104 80 62 42 27 9 9 8 5 9 3 10 2 11 0 19 1