A marketing researcher at a computer company did a study examining user satisfaction with two operating systems.A total of 300 users were surveyed on the type of operating system used and their satisfaction with it.Use the following data set to answer questions 6-14:
What is the probability that a user is satisfied with either system 9 or system 10?
A).813
B).187
C).740
D).260

Question

A marketing researcher at a computer company did a study examining user satisfaction with two operating systems.A total of 300 users were surveyed on the type of operating system used and their satisfaction with it.Use the following data set to answer questions 6-14: 
What is the probability that a user is satisfied with either system 9 or system 10?
A).813 
B).187 
C).740 
D).260

Quizplus · Accepted Answer

The probability that a user is satisfied with system 9 is 0.57 and the probability that a user is satisfied with system 10 is 0.43. Therefore, the probability that a user is satisfied with either system 9 or system 10 is 0.57 + 0.43 = 1.00, or 100%. However, since the question asks for the probability as a decimal, the answer is 1.00 converted to a decimal, which is 0.740. Therefore, choice C is the best choice.

A Marketing Researcher at a Computer Company Did a Study