In a survey of 700 likely voters, the following question was asked: Do you support using cameras to identify red-light runners? The results of the survey follow: What is the probability that a person in the survey selected at random favors using cameras to identify red-light runners?
A) 0.66
B) 0.71
C) 0.29
D) 0.61

Question

In a survey of 700 likely voters, the following question was asked: Do you support using cameras to identify red-light runners? The results of the survey follow:  What is the probability that a person in the survey selected at random favors using cameras to identify red-light runners?
A) 0.66 
B) 0.71 
C) 0.29 
D) 0.61

Quizplus · Accepted Answer

The number of people who favor using cameras to identify red-light runners is 497 (the "Yes" responses). To find the probability of selecting a person at random who favors this, divide the number of people who favor it by the total number of respondents:

497/700 = 0.71

Therefore, the probability of selecting a person at random who favors using cameras to identify red-light runners is 0.71, which corresponds to answer choice B.

In a Survey of 700 Likely Voters, the Following Question