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csc2iffy
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Homework Statement
This is one of my study guide questions and I need a little help
Suppose that in a class of 500 students 210 smoke, 258 drink, 216 snack, 122 smoke and drink, 83 snack and drink, 97 smoke and snack, and 52 do all three. What is the probability that a student:
(a) smokes but doesn't not drink
(b) snacks and drinks, but doesn't smoke
(c) neither smokes or drinks
Homework Equations
The Attempt at a Solution
Sm=smokes
D=drinks
Sn=snacks
(a) Prob(Sm [itex]\cap[/itex] ~D) = P(Sm)-P(Sm[itex]\cap[/itex]D = (210/500)-??