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How many people had all four items?

+1 vote

Out of 100 people surveyed, 75 percent had a personal computer, 68 percent had a dishwater, 85 percent had a refrigerator and 80 percent had a video recorder.
How many people had all four items?

posted Mar 11 by Balwinder

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2 Answers

0 votes

34 people

100*0.75*0.85*0.68*0.8= 34

answer Mar 11 by Hanifa Mammadov
0 votes

For 8 people, the logic is :
(Is my logic OK ?)

Out of 100 people,
-25 did not have PC,
-32 did not have DW
-15 did not have fridge
-20 did not have VC
Hence number of people having all the four are

But is there a loophole in above.
Numbers can not be added as some could be common, but not have 2 or 3 or any of the items.
If you go by probability theory then the answer is 34.68%

answer Mar 12 by anonymous
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