Answer
a. Country B has lower death rate in the 30 years and under age group.
b.Country B has lower death rate in the 30 years and under age group.
c. Country A has the lower overall death rate.
d. This is due to the amounts of death due to heart attack in country B being higher than in country A.
Work Step by Step
a. Death rate for the 30 years and under in country $A = (1000/40,000) = \frac{1}{40} = 0.025$
Death rate for the 30 years and under in country B $= (500/25,000) = \frac{1}{50} = 0.02$
Country B has lower death rate in the 30 years and under age group.
b. Death rate for the 31 years and over in country A $= (2000/20,000) = \frac{1}{10} = 0.1$
Death rate for the 31 years and over in country B $= (3000/35,000) = 0.086$
Country B has lower death rate for the age group of 31 years and over.
c. Death rate due to heart attack for the entire population of Country A
$= (1000+2000)/(40,000+20,000)$
$=3000/60,000$
$= 0.05$
Death rate due to heart attack for the entire population of Country B
$= (500+3000) /(25,000+35,000)$
$= 0.106 /2$
$= 0.0583$
