SOLUTION: in a certain department 40% of the students have internet facility 25% have printing facility and 15% have internet and printing facility student is selected at random from this de

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Question 549771: in a certain department 40% of the students have internet facility 25% have printing facility and 15% have internet and printing facility student is selected at random from this department (i)if he has internet what is the probabilty that he also has printing facility ?
(ii) if he has printing facility what is the probabilty that he also has internet ?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
in a certain department 40% of the students have internet facility
25% have printing facility and
15% have internet and printing facility
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A student is selected at random from this department
(i)if he has internet what is the probabilty that he also has printing facility ?
P(p | i) = P(p AND i)/P(i) = 0.15/0.4 = 0.375
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(ii) if he has printing facility what is the probabilty that he also has internet ?
P(i | p) = P(p AND i)/P(p) = 0.15/0.25 = 0.6
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Cheers,
Stan H.
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