find probability of foreign students

Statistics
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Records show that 7% of all college students are foreign students who also smoke. It is also known that 25% of all foreign college students smoke. What percent of the students at this university are foreign?

Feb 14th, 2015

Let C = number of college students

Let Fs = number of foreign students who smoke

Let F = number of foreign students

Then,

7%C = Fs   and  25%F = Fs

Therefore,

7%C = 25%F

.07C = 0.25F

F = .07/0.25C = 0.28C

So, 28% of the students are foreign

Feb 14th, 2015

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Feb 14th, 2015
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