document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=190981>Question 190981</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A random sample of 100 students at southern <BR>\n" );
document.write( "university was collected. The mean age was found to be 24.2 years, with a standard deviation of 3.4 years \r<BR>\n" );
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document.write( "A) what percent of students are over 27.6 years old<BR>\n" );
document.write( "b)what percent of the students are between 20.8 and 24.2 years old<BR>\n" );
document.write( "c) If a student is selected  at random from southern univesity, what is the probability that he or she will be over 20.8 years old\r<BR>\n" );
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document.write( "I could use some help </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #143397 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=143397\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A random sample of 100 students at southern <BR>\n" );
document.write( "university was collected. The mean age was found to be 24.2 years, with a standard deviation of 3.4 years <BR>\n" );
document.write( "A) what percent of students are over 27.6 years old<BR>\n" );
document.write( "z(27.6) = (27.6-24.2)/[3.4] = 1\r<BR>\n" );
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document.write( "P(x > 27.6) = P(z > 1) = 0.15866<BR>\n" );
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document.write( "b)what percent of the students are between 20.8 and 24.2 years old<BR>\n" );
document.write( "z(20.8) = (20.8-24.2)/3.4 = -1<BR>\n" );
document.write( "z(24.2) = 1<BR>\n" );
document.write( "So, P(20.8 < x < 24.2) = P(-1 < z < 1) = 0.68269<BR>\n" );
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document.write( "c) If a student is selected at random from southern univesity, what is the probability that he or she will be over 20.8 years old <BR>\n" );
document.write( "p(x > 20.8) = P(z > -1) = 0.84134<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. <BR>\n" );
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