document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1205781>Question 1205781</A>: <I><SPAN STYLE=\"word-break: break-all;\"> In a certain city, the distribution of the first-and second  -  born children of two  -  child families by gender is shown below.\r<BR>\n" );
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document.write( "First born	Second born	Total<BR>\n" );
document.write( "	Female 	Male 	<BR>\n" );
document.write( "Female 	530	510	1040<BR>\n" );
document.write( "Male 	480	430	910<BR>\n" );
document.write( "TOTAL	1010	940	1950\r<BR>\n" );
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document.write( "a.)	A family in this city with two children has a male first- born. What is the probability that its second- born is female? (5 points)\r<BR>\n" );
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document.write( "b.)	What is the probability that a family with two children selected at random in this city has children of same gender? (5 points) <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 #843275 by </B><A HREF=/tutors/aboutme.mpl?userid=premkumarlegend07><B>premkumarlegend07(1)</B></A><img src=\"/images/stars/iconNewId_16x16.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=premkumarlegend07><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=843275\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a) Given that, first- born is male.<BR>\n" );
document.write( "Now, probability that second- born is female = 480/910 = 0.53\r<BR>\n" );
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document.write( "b) probability that a family with two children selected are of same gender<BR>\n" );
document.write( "= (530+430)/1950  = 960/1950 = 0.49 </SPAN>\n" );
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