document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=128642>Question 128642</A>: <I><SPAN STYLE=\"word-break: break-all;\"> David's gasoline station offers 4 cents off per gallon if the customer pays in cash and does not use a credit card.  Past evidence indicates that 40% of all customers pay in cash.  During a one-hour period twenty-five customers buy gasoline at this station. \r<BR>\n" );
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document.write( "(4) What is the probability that at least ten pay in cash? <BR>\n" );
document.write( "	A)	0.416 <BR>\n" );
document.write( "	B)	0.575 <BR>\n" );
document.write( "	C)	0.586 <BR>\n" );
document.write( "	D)	0.425 <BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #94129 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=94129\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> David's gasoline station offers 4 cents off per gallon if the customer pays in cash and does not use a credit card. Past evidence indicates that 40% of all customers pay in cash. During a one-hour period twenty-five customers buy gasoline at this station. <BR>\n" );
document.write( "(4) What is the probability that at least ten pay in cash? <BR>\n" );
document.write( "A) 0.416 <BR>\n" );
document.write( "B) 0.575 <BR>\n" );
document.write( "C) 0.586 <BR>\n" );
document.write( "D) 0.425 <BR>\n" );
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document.write( "That is a binomial problem with n=25,p=0.4,10<=x<=25<BR>\n" );
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document.write( "I used the binomcdf function on a TI calculator to get:<BR>\n" );
document.write( "1-binomcdf(25,0.4,9) = 0.5754...<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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