document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=260099>Question 260099</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Can someone please help me understand this.\r<BR>\n" );
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document.write( "Based on past records, a car insurance company has determined that 9% of all drivers were involved in a car accident last year.  \r<BR>\n" );
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document.write( "a.  If 12 drivers were randomly selected, what is the probability of getting 0 who were involved in a car accident last year?<BR>\n" );
document.write( "b.  If 12 drivers were randomly selected, what is the probability of getting 3 or more who were involved in a car accident last year?    <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 #191548 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=191548\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Based on past records, a car insurance company has determined that 9% of all drivers were involved in a car accident last year.  \r<BR>\n" );
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document.write( "a.  If 12 drivers were randomly selected, what is the probability of getting 0 who were involved in a car accident last year?<BR>\n" );
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document.write( "This is a binomial problem with n = 12 ; p = 0.09<BR>\n" );
document.write( "P(x=0) = 12C0(0.09)^0(0.91)^12 = 0.91^12 = 0.3225<BR>\n" );
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document.write( "b.  If 12 drivers were randomly selected, what is the probability of getting 3 or more who were involved in a car accident last year?<BR>\n" );
document.write( "P(x>=3) = 1-P(0<= x <=2) = 1 - binomcdf(12,0.09,2) = 0.0866..<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.    <BR>\n" );
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