Dennis Barry, a hospital administrator, has examined past records from 210 randomly selected 8-hour shifts to determine the frequency with which the hospital treats fractures. The numbers of days in which zero, one, two, three, four, or fi ve or more patients with broken bones were treated were 25, 55, 65, 35, 20, and 10, respectively. At the 0.05 level of signifi cance, can we reasonably believe that the incidence of broken-bone cases follows a Poisson distribution with λ = 2?

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