Suppose the annual expected mortality rate from coronary disease is 500 per 100,000 individuals. In a specific community of 600,000 individuals, how many deaths are expected to be attributed to coronary heart disease over a one year period?

Question

my work: 600,000/100,000=6
6x500= 3000

The actual (observed) number of deaths attributed to coronary heart disease in the community was 4,500 individuals over a 1 yr period. what would be the observed/expected ratio for these deaths? reduce to simplest form.
my work: 4,500/3000 =1.5 more

of the 4,500 individuals that died form coronary heart disease, it was determined that twice the number of makes died from it than females. How many makes died from coronary heart disease?
my answer: 3000 men

could someone double check me please? thanks

Answer 1

Your answer to a) is correct, but I find your order of arithmetic odd.
I would have found the probability of disease first
= 500/100000
= 1/200
then number of expected deaths
= (1/200)(600,000) = 3000

b) ratio of observed : expected
= 4500 : 3000
= 3 : 2
(it asked for the ratio)

c) number of females --- x
number of males ---- 2x
x + 2x = 4500
3x = 4500
x = 1500

so 1500 females and 3000 males died
You were correct