document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=252818>Question 252818</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A student takes a multiple choice exam with 10 questions, each with four possible selections for the answer. A passing grade is 60% or better. Suppose that the student was unable to find time to study for the exam and just guesses at each question. Find the probability that the student\r<BR>\n" );
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document.write( "a. gets at least one question correct<BR>\n" );
document.write( "b. passes the exam<BR>\n" );
document.write( "c. receives an \"A\" on the exam (90% or better)<BR>\n" );
document.write( "d. How many questions would you expect the student to get correct?<BR>\n" );
document.write( "e. Obtain the standard deviation of te number of questions that the student gets correct </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #184911 by </B><A HREF=/tutors/aboutme.mpl?userid=richwmiller><B>richwmiller(17219)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richwmiller><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=richwmiller><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=184911\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> D)<BR>\n" );
document.write( "I would expect about 25% or 1/4 since there are four choices per question.\r<BR>\n" );
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document.write( "so 10*1/4=10/4= between two and three correct\r<BR>\n" );
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document.write( "A) There is good chances of getting at least one right.<BR>\n" );
document.write( "B) slim to none that he will pass and <BR>\n" );
document.write( "C)a better chance of winning the megalottery than getting  90%<BR>\n" );
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