In a survey conducted in November 2002 of 1,400 international business travelers concerning in-flight service over the past few years, the following information was obtained. If a person in the survey is chosen at random, what is the probability that he or she has rated the in-flight service as remaining the same or improved over the time frame in question?
A) 0.695
B) 0.655
C) 0.685
D) 0.675
E) 0.665

Question

In a survey conducted in November 2002 of 1,400 international business travelers concerning in-flight service over the past few years, the following information was obtained.  ​ If a person in the survey is chosen at random, what is the probability that he or she has rated the in-flight service as remaining the same or improved over the time frame in question?
A) 0.695 
B) 0.655 
C) 0.685 
D) 0.675 
E) 0.665

Quizplus · Accepted Answer

To find the probability that a person has rated the in-flight service as remaining the same or improved, we need to add the percentage who rated it as "same" and "better". According to the chart, 38% rated it as "better" and 31% rated it as "same". Therefore, the probability is:
P(same or better) = 0.38 + 0.31 = 0.69
The closest answer choice to this value is C) 0.685.

In a Survey Conducted in November 2002 of 1,400 International