A survey of top executives revealed that 35% of them regularly read Time magazine, 20% read Newsweek and 40% read U.S. News & World Report. Ten percent read both Time and U.S. News & World Report. What is the probability that a particular top executive reads either Time or U.S. News & World Report regularly?
A) 0.85
B) 0.06
C) 1.00
D) 0.65

Question

Quizplus · Accepted Answer

We can use the formula: 
P(Time or US News) = P(Time) + P(US News) - P(Time and US News)

Plugging in the given values, we get: 
P(Time or US News) = 0.35 + 0.40 - 0.10 = 0.65

Therefore, the probability that a particular top executive reads either Time or U.S. News & World Report regularly is 0.65, which corresponds to option (D).

A Survey of Top Executives Revealed That 35% of Them