Please check my work and if I am doing wrong please explain my error ... I am struggling in this subject and not really sure why

Assignment

In a 1985 study, Breslow (cited in Hand et al., 1994) examined the death rates from coronary heart disease in a set of British male physicians. He also classified the doctors according to whether or not they smoked cigarettes. The table below shows the number of physicians who died from coronary heart disease.

Age, smoking, and heart disease in a sample of male physicians

Age (in years)	Nonsmokers	Smokers
35-44	2	32
45-54	12	104
55-64	28	206
65-74	28	186
75-84	31	102

Use the data to answer the following questions:

How many doctors were surveyed? 731

How many of these doctors reported that they smoked?630

How many reported that they did not smoke? 101

What is the probability that a person between the ages of 35 and 44 will die of coronary disease? P(a)=#(A)/#(S) P=34/731 P= 0.04651163

What is the risk that a smoker in this age group will die of heart disease? 32/731 P= 0.04377565

What is the probability that a smoker between the ages of 75 and 84 will die of coronary disease? P= 102/731 P= 0.13953488

At what age is the probability of dying of coronary disease the highest for smokers?

Age 55-64