document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1166146>Question 1166146</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Ques-1_(The lifetime of 20,000 flashlight batteries are normally distributed, <BR>\n" );
document.write( "with a mean of 370 days and a standard deviation of 30 days. How <BR>\n" );
document.write( "many batteries can be expected to last less than 325 days?)\r<BR>\n" );
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document.write( "Ques-2_(The natural log of income has a normal distribution with mean 10.35 <BR>\n" );
document.write( "and variance 2.5. What is the probability that a person has income <BR>\n" );
document.write( "below $10,000?) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #790647 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=790647\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> ln 10000=9.21<BR>\n" );
document.write( "so want z<(9.21-10.35)/sqrt 2.5<BR>\n" );
document.write( "z<-1.14/1.58<BR>\n" );
document.write( "z< -0.72<BR>\n" );
document.write( "that has probability of 0.2358\r<BR>\n" );
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document.write( "the first one z=(325-370)/30 or -45/30 or -1.5<BR>\n" );
document.write( "that probability is 0.0668--for some reason I had the wrong number earlier. <BR>\n" );
document.write( "unrounded, multiply that by 20000 to get 1336.14 or 1336 batteries. </SPAN>\n" );
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