document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=55594>Question 55594</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0395977258/algebrahomeworkh>Algebra and Trigonometry</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> Hey, I'm having a ton of trouble with these four problems out of a huge packet, could someone please help me out? :]\r<BR>\n" );
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document.write( "1. what is the (a)variance, and the (b)standard deviation of the following scores : 51, 55, 61, 62, 68, 71, 71, 73, 81, 82, 87, 89, 92, 94, 95, 100\r<BR>\n" );
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document.write( "2. Suppose a contest offers $1,000 to the person who can guess the winning four digit number. How many possibilities are there?\r<BR>\n" );
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document.write( "3. Suppose there are 10 items on a true-false quiz. The person taking the test does not read the questions; he just answers the questions randomly. What is the probability of his guessing all answers correctly? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #37737 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=37737\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 1. what is the (a)variance, and the (b)standard deviation of the following scores : 51, 55, 61, 62, 68, 71, 71, 73, 81, 82, 87, 89, 92, 94, 95, 100 <BR>\n" );
document.write( "a) 216.375 ; b)14.7097<BR>\n" );
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document.write( "2. Suppose a contest offers $1,000 to the person who can guess the winning four digit number. How many possibilities are there? <BR>\n" );
document.write( "There are 10^4=10000 4-digit sequences if you allow any of the 10 digits to occupy each of the four digit positions. <BR>\n" );
document.write( "What \"possibilities\" are you looking for? <BR>\n" );
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document.write( "3. Suppose there are 10 items on a true-false quiz. The person taking the test does not read the questions; he just answers the questions randomly. What is the probability of his guessing all answers correctly?<BR>\n" );
document.write( "Each answer has two possibilities.<BR>\n" );
document.write( "The prob of getting one answer correct is 1/2<BR>\n" );
document.write( "The probl of getting 10 correct is (1/2)^10 = 1/1024<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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