document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=221107>Question 221107</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Let X be a normal random variable with mean 20 and standard deviation 4.  Find P(X < 19). </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #165877 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=165877\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let X be a normal random variable with mean 20 and standard deviation 4. Find P(X < 19).<BR>\n" );
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document.write( "Find the z-score of 19<BR>\n" );
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document.write( "z(19) = (19-20)/4 = 0.25<BR>\n" );
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document.write( "P(x<19) = P(z<0.25) = 0.5987<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H> </SPAN>\n" );
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