Answer :
The proportion of people who never had a cavity is 0.92.
What are ratio and proportion?
A ratio is a comparison between two similar quantities in simplest form.
Proportions are of two types one is the direct proportion in which if one quantity is increased by a constant k the other quantity will also be increased by the same constant k and vice versa.
In the case of inverse proportion if one quantity is increased by a constant k the quantity will decrease by the same constant k and vice versa.
Given, 8% of adults have never had a cavity. A dental graduate student contacts an srs of 1000 adults.
8% of 1000 is,
= (8/100)×1000.
= 80.
Now, The proportion of people who never had a cavity is (1000 - 80)/100.
= 920/1000.
= 92/100.
= 0.92 proportion of people never had a cavity.
learn more about proportion here :
https://brainly.com/question/7096655
#SPJ1
