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Suppose there is a snack machine in the library which seems
\n" ); document.write( "to randomly malfunction. After you put money in it and select
\n" ); document.write( "a snack, it sometimes gives you the snack you asked for,
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\n" ); document.write( "it gives you nothing. When you are in the library for a few
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document.write( "(a) State the sample space\r\n" );
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document.write( "Let Y = \"You get the snack you want.\r\n" );
document.write( "Let N = \"You get a snack, but not the one you wanted.\r\n" );
document.write( "Let 0 = \"You get no snack at all\".\r\n" );
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document.write( "Sample space = {YY, YN, Y0, NY, NN, N0, 0Y, 0N, 00}\r\n" );
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document.write( "(b) Find the probability of getting no snack both times.\r\n" );
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document.write( "P(00) = 1 way out of 8 = 1/8 \r\n" );
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document.write( "(c) Find the probability of getting no snack at least once.\r\n" );
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document.write( "P(Y0 or N0 or 0Y or 0N or 00) = P(Y0)+P(N0)+P(0Y)+P(0N)+P(00) =\r\n" );
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document.write( "1/8+1/8+1/8+1/8+1/8 = 5/8\r\n" );
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document.write( "(d) Find the probability of not getting no snack both times.\r\n" );
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document.write( "That's a double negative, bad grammar.\r\n" );
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document.write( "You would get a snack both times.\r\n" );
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document.write( "1 - P(00) = 1 - 1/8 = 7/8\r\n" );
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document.write( "Edwin \n" );
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