Suppose a study of incidence rates of blindness among insulin-dependent diabetics reported that the annual incidence rate of blindness per year was 0.68% among 30- to 39-year-old male insulin-dependent diabetics (IDDM) and 0.75% among 30- to 39-year-old female insulin-dependent diabetics.

(a)If a group of 160 IDDM 30- to 39-year-old men is followed, what is the probability that exactly 2 will go blind over a 1-year period? (Round your answer to four decimal places.)

(b)If a group of 160 IDDM 30- to 39-year-old women is followed, what is the probability that at least 2 will go blind over a 1-year period? (Round your answer to four decimal places.)

(c)What is the probability that a 30-year-old IDDM male patient will go blind over the next 10 years? (Round your answer to four decimal places.)

(d)After how many years of follow-up would we expect the cumulative incidence of blindness to be 10% among 30-year-old IDDM women, if the incidence rate remains constant over time? (Round your answer to one decimal place.) years

(e)What does cumulative incidence mean, in words, in the context of the problem in part (d)?

The cumulative incidence discovered in part (d) means that after ________ years, there is a 10% probability that a woman with IDDM will not or will? become blind