document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=971953>Question 971953</A>: <I><SPAN STYLE=\"word-break: break-all;\"> [The other time i [ask free tutors] without registering, so.. this q is a repeat, thank you tutors! i am really glad to stumble upon this site! really helps me a lot!]\r<BR>\n" );
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document.write( "A study of the checkout lines at the Safeway Supermarket in the South Strand area revealed that between 4 and 7 P.M. on weekdays there is an average of four customers waiting in line. What is the probability that you visit Safeway today during this period and find:<BR>\n" );
document.write( "a. No customers are waiting?<BR>\n" );
document.write( "b. Four customers are waiting?<BR>\n" );
document.write( "c. Four or fewer are waiting?<BR>\n" );
document.write( "d. Four or more are waiting? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #594368 by </B><A HREF=/tutors/aboutme.mpl?userid=reviewermath><B>reviewermath(1029)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=reviewermath><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=reviewermath><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=594368\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A study of the checkout lines at the Safeway Supermarket in the South Strand area revealed that between 4 and 7 P.M. on weekdays there is an average of four customers waiting in line. What is the probability that you visit Safeway today during this period and find:<BR>\n" );
document.write( "Let X = number of customers between 4 and 7 P.M. on weekdays at the Safeway Supermarket in the South Strand area<BR>\n" );
document.write( "a. No customers are waiting?<BR>\n" );
document.write( "P(X = 0) = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28e%5E%28-4%29%29%284%5E0%29%2F0%21 ALIGN=MIDDLE  ALT=\"%28e%5E%28-4%29%29%284%5E0%29%2F0%21\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%280.0183%29 ALIGN=MIDDLE  ALT=\"highlight%280.0183%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "b. Four customers are waiting?<BR>\n" );
document.write( "P(X = 4) = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28e%5E%28-4%29%29%284%5E4%29%2F4%21 ALIGN=MIDDLE  ALT=\"%28e%5E%28-4%29%29%284%5E4%29%2F4%21\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%280.1954%29 ALIGN=MIDDLE  ALT=\"highlight%280.1954%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "c. Four or fewer are waiting?<BR>\n" );
document.write( "P(X &#8804; 4) = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sum%28%28e%5E%28-4%29%29%284%5Ex%29%2Fx%21%2C+x+=+0%2C+4%29 ALIGN=MIDDLE  ALT=\"sum%28%28e%5E%28-4%29%29%284%5Ex%29%2Fx%21%2C+x+=+0%2C+4%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%280.6288%29 ALIGN=MIDDLE  ALT=\"highlight%280.6288%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "d. Four or more are waiting?<BR>\n" );
document.write( "P(X &#8805; 4) = 1 - P(X &#8804; 3)<BR>\n" );
document.write( "         = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1+-+sum%28%28e%5E%28-4%29%29%284%5Ex%29%2Fx%21%2C+x+=+0%2C+3%29 ALIGN=MIDDLE  ALT=\"1+-+sum%28%28e%5E%28-4%29%29%284%5Ex%29%2Fx%21%2C+x+=+0%2C+3%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%280.5665%29 ALIGN=MIDDLE  ALT=\"highlight%280.5665%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >  </SPAN>\n" );
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