You answered it incorrectly. I should have specified there's not enough information to answer it correctly.
Math experts also scuba right?
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Oh, OK.Walter:
The Kraken
He Who Glows in the Dark Waters (ADVISOR)
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It's a trick question. The answer has already been given to you.
nk25, the answer is 72%, I promise 
Don Burke
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Upon further review, you are correct.
The answer would be 50+41-19=72, or 72 in 100.
Nice catch.
The answer would be 50+41-19=72, or 72 in 100.
Nice catch.
jonnythan:
No, it's not meaningless. The 19% tells you that 19 people belong to both the set of workers and the set of students. In other words, 91% is wrong because you didn't subtract the 19 from it.Don Burke:
Charlie99
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Why? I find Jonnythan's analysis to be clear, simple, and accurate.Don Burke:
The statements of 50% work, 41% school, 19% both can also be expressed as 31% work only, 22% school only, 19% both (See Jonnythan's diagram).
Don Burke
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What other information would you need?Walter:
Don Burke
Contributor
My bust. I made the mistake of answering before my tenth cup of coffee.Charlie99:
miketsp
Contributor
Jonnythan's calculation is quite correct as the problem is stipulated.
Out of a universe of 100
50 work
19 do both which is the overlap
leaves 22 that only go to school
so 72 (=72%) do something
leaving 28 (=28%) lazy bums.
So:
What is the probability that by randomly choosing someone in this age group that you will pick someone who is working full-time Answer=50%
or going to school Answer=41%
or both? Answer = 19%
Just for the record
or either? Answer=72%
Out of a universe of 100
50 work
19 do both which is the overlap
leaves 22 that only go to school
so 72 (=72%) do something
leaving 28 (=28%) lazy bums.
So:
What is the probability that by randomly choosing someone in this age group that you will pick someone who is working full-time Answer=50%
or going to school Answer=41%
or both? Answer = 19%
Just for the record
or either? Answer=72%
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