@ganeshie8
At Hamilton University, it is observed that 90% of the students pass mathematics, 85% pass English, 78% pass both courses.
What are the odds in favour of passing mathematics and failing English?
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OpenStudy (anonymous):
|dw:1416074886044:dw| The Venn diagram is not in question i just made that to see it better, not sure if its right though.
OpenStudy (amistre64):
|dw:1416075418742:dw|
OpenStudy (amistre64):
the odds are 12 to 100-12
OpenStudy (anonymous):
Unfortunately i dont see how you got that
OpenStudy (anonymous):
but it is right
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OpenStudy (amistre64):
assuming 100 people
(pass math) - (pass math and pass english) = (pass math and fail english)
agreed?
OpenStudy (anonymous):
yes
OpenStudy (amistre64):
so 90-78 = 12
odds tend to be written as for:against such that for + against is equal to the total population count
OpenStudy (amistre64):
since we assumed 100:
then 12 are for, and 100-12 are againt
OpenStudy (anonymous):
oh okay
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OpenStudy (amistre64):
or written another way: U = A + A'
and odds are written as: A : A'