Answer:
481 / 2142 = 22.46%
A pie chart is also commonly used to illustrate it.
Explanation:
We can get the sample proportion of every case, applying the following relations:
1288 / 2142 (60.13%) answered "no"
481 / 2142 (22.46%) answered "yes"
373 / 2142 (17.41%) had no opinion
where 2142 (1288 + 481 + 373 = 2142) is the total of adults who were asked.