Question

A geneticist conducts a study to investigate the prevalence of a certain genetic marker in a particular population of the United States (US) adult. During the study the geneticist observed the genetic code of 1,000 randomly selected US adults in the population and finds that 350 of those adults have the genetic marker. According to the results of the study, what is the ratio of observed adults with the genetic marker to observed adults without the genetic marker? A. 7:13 B. 13:7 C. 7:20 D. 13:20

Answer 1

A. 7:13

Explanation:

The number of observed adults with the genetic marker is 350 out of 1000.

The number of observed adults without the genetic marker is 1000-350 =650 out of 1000.

Therefore

the ratio of observed adults with the genetic marker to observed adults without the genetic marker

equals

`(350)/(650)`

When we divide both sides by 10 and then by 5 we get

`(35)/(65)` =
`(7)/(13)`