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Suppose is a semester that 38% of students at a college failed mathematics, 27% failed physics, and
9% failed both. A student is selected at random.
a)If a student failed physics, what is the probability that he or she failed math?
b)If a student failed math, what is the probability he or she failed physics?
c) What is the probability that he or she failed math or physics?

Respuesta :

Hagrid
=>  38% of students at a college failed mathematics
 => 27% failed physics, and=> 9% failed both. A student is selected at random.

a)If a student failed physics, what is the probability that he or she failed math?
=> 1/38 
b)If a student failed math, what is the probability he or she failed physics?
=> 1/27
c) What is the probability that he or she failed math or physics?
=> 1/9

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