What is the probability that a particular top executive reads either Time or U.S. News & World Report regular?
February 16th, 2009 | by admin |
Cool guy asked:
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
E)None of the above
Alysia
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
E)None of the above
Alysia
2 Responses to “What is the probability that a particular top executive reads either Time or U.S. News & World Report regular?”
By mediaptera on Feb 18, 2009 | Reply
We add the 35% of executives who read Time to the 20% who read News & World Report and subtract the 10 that were double-counted to discover 45% of executives read either Time or News & World Report.
The answer is E, none of the above.
By skyblue8596 on Feb 20, 2009 | Reply
First of all, you can forget about 20% of Newsweek reader, it’s there to confuse you.
35% read TM, 40% read US&WR, and 10% read both.
To put it simply, the 10% that read both, are already included in 35% TM and 40% US&WR.
So, to find the percentage of reader that read either TM or US&WR, you just have to add the two individual percentage, and subtract it with the percentage for both.
= 40% + 35 % - 10 %
= 65%
The answer is D.