Suppose that we have 100 women who are age 55 in the year 1995. What is the probability that at least 2 of them will develop breast cancer by 1996? 

The SEER data is also available for the time period 2001–2006 (period B) as shown in Table 3.20.

Table 3.20 Breast cancer 1-year cumulative incidence rates by age among Caucasian women age 50–74, SEER 2001–2006 (period B)

Age group ____________ 1-year cumulative incidence per 100,000 women+
50–54 ...................................................................... 314
55–59 ...................................................................... 412
60–64 ...................................................................... 510
65–69 ...................................................................... 544
70–74 ...................................................................... 558