Question 987530
in a class that consists of 50, 35 use facebook,25 use instagram. a) what is the max/min number that use both. a) what is the max/min number that use both.
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Draw two intersecting circles inside a rectangle.
Label the circles F and I
F = 35 ; I = 25
Put "x" in the intersection.
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a) what is the max/min number that use both.
F has two sections: x and 35-x
I has two sectiions: x and 25-x
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Equation:
35-x + x + 25-x <= 50
60-x <= 50
x >= 10
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b) suppose 20 students use both, if a student randomly selected, what is the probability that the student doesn't use either facebook or instagram?
20 in the intersection
At most 30 are in the rectangle and not in F or I
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Cheers,
Stan H.
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