document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=235733>Question 235733</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I'm going to type the word problem. Help me with this. \r<BR>\n" );
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document.write( "Mary's class took two tests last week. 80% of the class passed the math test, 90% of the class passed the English test, and 72% of the class passed both. What is the probability that a randomly selected student in Mary's class failed both tests? Express your answer as a percent rounded to the nearest tenth of a percent. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #173548 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=173548\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Mary's class took two tests last week. 80% of the class passed the math test, 90% of the class passed the English test, and 72% of the class passed both. What is the probability that a randomly selected student in Mary's class failed both tests? Express your answer as a percent rounded to the nearest tenth of a percent.<BR>\n" );
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document.write( "P(passed M or passed E) = P(M) + P(E) - P(M and E)<BR>\n" );
document.write( "P(passed Math or Eng) = 0.8 + 0.9 - 0.72 = 0.98<BR>\n" );
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document.write( "P(did not pass Math or Eng) = 1-0.98 = 0.02<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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