document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=313293>Question 313293</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I was wondering if anyone can tell me if  got these right:<BR>\n" );
document.write( "Suppose that a student needs to buy 6 books for her history course. The number of books that she will be able to find used is a binomial random variable X with n = 6 and p = 0.30. In other words, the probability that she will find any given book used is 0.30, and is independent from one book to the next. What is the expected number of used books she will find, E(X)= 1.8\r<BR>\n" );
document.write( "\n" );
document.write( "Using Standard Normal Table, what is the probability that Z is less than or equal to 2, P(Z &#8804; 2)=0.9772\r<BR>\n" );
document.write( "\n" );
document.write( "and finally,<BR>\n" );
document.write( "Using Standard Normal Table, find P(-0.1 < Z < 0.5)=.6687\r<BR>\n" );
document.write( "\n" );
document.write( "Thanks for all your help,<BR>\n" );
document.write( "Donnie </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #224034 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=224034\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Suppose that a student needs to buy 6 books for her history course. The number of books that she will be able to find used is a binomial random variable X with n = 6 and p = 0.30. In other words, the probability that she will find any given book used is 0.30, and is independent from one book to the next. What is the expected number of used books she will find, E(X)= np = 1.8<BR>\n" );
document.write( "OK<BR>\n" );
document.write( "----------------------------------------- <BR>\n" );
document.write( "Using Standard Normal Table, what is the probability that Z is less than or equal to 2, P(Z &#8804; 2)=0.9772<BR>\n" );
document.write( "OK<BR>\n" );
document.write( "---------------------- <BR>\n" );
document.write( "and finally,<BR>\n" );
document.write( "Using Standard Normal Table, find P(-0.1 < Z < 0.5)=.6687 <BR>\n" );
document.write( "No.  I get 0.2313<BR>\n" );
document.write( "======================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );