Question

How is the number of people affected at a given time and the total population used to calculate?

1) By dividing the number of people affected by the total population
2) By multiplying the number of people affected by the total population
3) By subtracting the number of people affected from the total population
4) By adding the number of people affected to the total population

Answer 1

To find out what fraction or percentage of a population is affected by something, divide the number of people affected by the total population.

Step-by-step explanation:

To calculate how the number of people affected by something relates to the total population, you would divide the number of people affected by the total population. This provides a proportion or a percentage that reflects the extent to which something affects a population. This calculation is commonly used in demography to determine the prevalence of a disease or measure voter turnout.

The formula for prevalence rate is:

Prevalence Rate = Number of cases of a disease in a population ÷ Number of at-risk people during a time period

This calculation provides a measure of how common a disease is in a population.