If there are 12,000 births in the census tract in 1 year, then what is the probability that there will be at least 8 cases of the birth defect during the year (census tract B in Table 4.21)?

Table 4.21: Relationship between incidence of birth defects and census tract

Suppose the incidence of the same birth defect in a low SES census tract is 100 cases per 100,000 births.

Obstetrics
Suppose the incidence of a specific birth defect in a high socioeconomic status (SES) census tract is 50 cases per 100,000 births.

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Incidence of birth defects Incidence of birth defects Number of births/yr Number of births/yr Census tract Census tract SES SES High 5000 12,000 10,000 Low Low High Low 100/10° 100/10 50/10° 100/10 100/10 7000 Low 20,000 50/10 100/10 Low Low 5000 H. 100/10 8000 3000 70,000 Total