document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=922803>Question 922803</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A multiple choice test has 100 questions. For subjects making random guesses for each answer, the mean number of correct answers is 20.0 and the standard deviation of the numbers of correct answers is 4.0. For someone making random guesses for all answers, is it unusual to get 25 correct answers? Use statistics to justify your answer. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #559748 by </B><A HREF=/tutors/aboutme.mpl?userid=ewatrrr><B>ewatrrr(24785)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ewatrrr><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=ewatrrr><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=559748\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> mean = 20.0 and the standard deviation = 4.0.<BR>\n" );
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document.write( "Z = 5.05/4  AND Z = 4.95/4<BR>\n" );
document.write( "P(x = 25) = normalcdf(1.2375,1.2625) = .00457  using TI<BR>\n" );
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document.write( " P(z &#8804; 1.2625)- P(z &#8804; 1.2375) = .8966- 8920 = .0046  using z-value </SPAN>\n" );
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