In the decade 1982 through 1991, 10 employees working at the Amoco Company chemical research center were stricken with brain tumors.
The average employment at the center was 2000 employees. Nationwide, the average incidence of brain tumors in a single year is 20 per 100,000 people.
If the incidence of brain tumors at the Amoco chemical research center were the same as the nationwide incidence, what is the probability that at least 10 brain tumors would have been observed among Amoco workers during the decade 1982 through 1991? What do you conclude from your analysis? (Source: AP wire service report, March 12, 1994)