document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=759440>Question 759440</A>: <I><SPAN STYLE=\"word-break: break-all;\"> According to a report by Scarborough Research, the average monthly household cellular phone bill is $73. Suppose local monthly household cell phone bills are normally distributed with a standard deviation of $11.35. <BR>\n" );
document.write( "a. What is the probability that a randomly selected monthly cell phone bill is more than $100? <BR>\n" );
document.write( "b. What is the probability that a randomly selected monthly cell phone bill is between $60 and $83? <BR>\n" );
document.write( "c. What is the probability that a randomly selected monthly cell phone bill is between $80 and $90? <BR>\n" );
document.write( "d. What is the probability that a randomly selected monthly cell phone bill is no more than $55?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #462032 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=462032\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> According to a report by Scarborough Research, the average monthly household cellular phone bill is $73. Suppose local monthly household cell phone bills are normally distributed with a standard deviation of $11.35.\r<BR>\n" );
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document.write( "a. What is the probability that a randomly selected monthly cell phone bill is more than $100?<BR>\n" );
document.write( "Enter =1-normdist(100,73,11.35,TRUE) on EXCEL, the result is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%280.008683%29 ALIGN=MIDDLE  ALT=\"highlight%280.008683%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >.\r<BR>\n" );
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document.write( "b. What is the probability that a randomly selected monthly cell phone bill is between $60 and $83?<BR>\n" );
document.write( "Enter =normdist(83,73,11.35,TRUE)-normdist(60,73,11.35,TRUE) on EXCEL, the result is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%280.68483%29 ALIGN=MIDDLE  ALT=\"highlight%280.68483%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >.\r<BR>\n" );
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document.write( "c. What is the probability that a randomly selected monthly cell phone bill is between $80 and $90?<BR>\n" );
document.write( "Enter =normdist(90,73,11.35,TRUE)-normdist(80,73,11.35,TRUE) on EXCEL, the result is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%280.20161%29 ALIGN=MIDDLE  ALT=\"highlight%280.20161%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >.\r<BR>\n" );
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document.write( "d. What is the probability that a randomly selected monthly cell phone bill is no more than $55? <BR>\n" );
document.write( "Enter =normdist(55,73,11.35,TRUE) on EXCEL, the result is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%280.056381%29 ALIGN=MIDDLE  ALT=\"highlight%280.056381%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( " </SPAN>\n" );
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