document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=204453>Question 204453</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/9780073048253/algebrahomeworkh>elementary statistics</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> Find these probabillities for a sample of 20 teenagers if 70% of them had compact disk players by the age of 16. Round to three decimal places, example 0.123. \r<BR>\n" );
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document.write( "a. At least 14 had CD players.<BR>\n" );
document.write( "b. Exactly 9 had CD players.<BR>\n" );
document.write( "c. More than 17 had CD players. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #154354 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=154354\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Find these probabillities for a sample of 20 teenagers if 70% of them had compact disk players by the age of 16. Round to three decimal places, example 0.123. <BR>\n" );
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document.write( "Hopefully you have software or a calculator to work these binomial problems.<BR>\n" );
document.write( "If not you will have to use z-scores and a Table of z-values.<BR>\n" );
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document.write( "a. At least 14 had CD players.<BR>\n" );
document.write( "P(14 < x <= 20) = 1 - binomcdf(20,0.7,13) = 0.6080<BR>\n" );
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document.write( "b. Exactly 9 had CD players.<BR>\n" );
document.write( "P(x = 9) = binompdf(20,0.7,9) = 0.0120<BR>\n" );
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document.write( "c. More than 17 had CD players.<BR>\n" );
document.write( "P(18 <= x <=20) = 1 - binomcdf(20,0.7,17) = 0.03548<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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