document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1176406>Question 1176406</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The amounts of time per workout an athlete uses a stair climber are normally distributed, with a mean of 24 minutes and a standard deviation of 7 minutes.<BR>\n" );
document.write( "Find the probability that a randomly selected athlete uses a stair climber for:\r<BR>\n" );
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document.write( "(a) less than 20 minutes<BR>\n" );
document.write( "(b) between 24 and 32 minutes<BR>\n" );
document.write( "(c) more than 40 minutes\r<BR>\n" );
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document.write( "*(Round to four decimal places as needed) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #803393 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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/cgi-bin/show-face.mpl?user=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=803393\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> z+(x-mean)/sd<BR>\n" );
document.write( "a. z < (20-24)/7 or z < -4/7 probability  is 0.2839<BR>\n" );
document.write( "b.  z between 0 and 8/7. That probability is 0.3735<BR>\n" );
document.write( "can do on calculator with 2nd VARS2 normalcdf (24,32,24,7)<BR>\n" );
document.write( "c. more than 40 minutes, can do the same way picking a high top end like 100<BR>\n" );
document.write( "probability is 0.0111<BR>\n" );
document.write( "it is also the probability z > 16/7<BR>\n" );
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