document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=403928>Question 403928</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I need some help with these questions.\r<BR>\n" );
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document.write( "Mary and jim are taking the same math class and have a quiz coming up next tuesday.  The probability that mary studies is 0.8 and the probability that jim studies is 0.7.\r<BR>\n" );
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document.write( "1.  If Mary and Jim studying are independent events then waht is the probability that mary and jim both study? \r<BR>\n" );
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document.write( "2.  What is the probability that mary studies if we know that jim studies?\r<BR>\n" );
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document.write( "3.  What is the probability that mary studies OR jim does not? \r<BR>\n" );
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document.write( "Thanks for your help.<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #285526 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=285526\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Mary and jim are taking the same math class and have a quiz coming up next tuesday. The probability that mary studies is 0.8 and the probability that jim studies is 0.7. <BR>\n" );
document.write( "1. If Mary and Jim studying are independent events then what is the probability that mary and jim both study?:::0.8*0.7<BR>\n" );
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document.write( "2. What is the probability that mary studies if we know that jim studies?<BR>\n" );
document.write( "P(Mary studies|jim studies) = 0.8 because they are independent<BR>\n" );
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document.write( "3. What is the probability that mary studies OR jim does not? <BR>\n" );
document.write( "P(mary does OR jim does not) = P(mary) + p(jim not) -P(mary and Jim does not)<BR>\n" );
document.write( "= 0.8 + 0.3 - (0.8*0.3)<BR>\n" );
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document.write( "= 1.1-0.24<BR>\n" );
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document.write( "= 0.86<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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