document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=267238>Question 267238</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 2.	One out of 10 students [10%] don’t buy a book for their statistics class. In a class of 25 students [assume these students are a random selection from the population of all students who might take this course], calculate the following probabilities.<BR>\n" );
document.write( "a.	P(3 or fewer students don’t buy a book) =\r<BR>\n" );
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document.write( "b.	P(exactly 3 students don’t buy a book) = \r<BR>\n" );
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document.write( "c.	P(exactly 5 students did buy a book) = </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #196188 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=196188\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> One out of 10 students [10%] don’t buy a book for their statistics class. In a class of 25 students [assume these students are a random selection from the population of all students who might take this course], calculate the following probabilities.<BR>\n" );
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document.write( "A binomial problem with n= 25 ; p = 0.1<BR>\n" );
document.write( "a. P(3 or fewer students don’t buy a book) = binomcdf(25,0.1,3) = 0.7636 <BR>\n" );
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document.write( "b. P(exactly 3 students don’t buy a book) = binompdf(25,0.1,3) = 0.2265 <BR>\n" );
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document.write( "c. P(exactly 5 students did buy a book) = binompdf(25,0.99,5) <BR>\n" );
document.write( "= 25C5(0.99)^5(0.1)^20 = 5.053x10^-16<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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