document.write( "Question 1098894: In Pennsylvania, 78% of all teenagers own an i-pod and 45% of all teenagers own an i-pod and a cell phone. What is the probability that a teenager owns a cell phone, given that the teenager owns an i-pod. \n" ); document.write( "

Algebra.Com's Answer #713285 by ikleyn(52781) $\"\"$ $\"About$

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\n" ); document.write( "Let me re-formulate it equivalently in this simple form:\r
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document.write( "    Of every 100 teenagers, 78 have an i-pod and 45 have both i-pod and sell phone.\r\n" );
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\n" ); document.write( "\n" ); document.write( "Then it is absolutely clear that the probability under the question is $\"45%2F78\"$ .\r
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\n" ); document.write( "\n" ); document.write( "The equivalent formula of the Probability theory is P(A|B) = $\"P%28A%29%2FP%28B%29\"$ = $\"0.45%2F0.78\"$ .\r
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