document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=601855>Question 601855</A>: <I><SPAN STYLE=\"word-break: break-all;\">  Let the random variable Z follow a standard normal distribution. The probability is 0.25 that Z is less than what number? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #380034 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=380034\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let the random variable Z follow a standard normal distribution. The probability is 0.25 that Z is less than what number?<BR>\n" );
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document.write( "Draw a normal curve<BR>\n" );
document.write( "Let the horizontal base be the z line.<BR>\n" );
document.write( "z = 0 is the middle point of that base.<BR>\n" );
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document.write( "Find a point that has 0.25 of the area to the left.<BR>\n" );
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document.write( "Find the z-value of that point.<BR>\n" );
document.write( "inv(0.25) = -0.6745<BR>\n" );
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document.write( "Note: P(z < -0.6745) = 0.25<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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