document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=912886>Question 912886</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A recent survey found that 56% of mobile phone users, between the ages of 18 to 34, had<BR>\n" );
document.write( "a smartphone. Suppose a random sample of 20 mobile phone users were selected. What is<BR>\n" );
document.write( "the probability that less than 5 of them have a smartphone? [Ensure that you (1) clearly<BR>\n" );
document.write( "denote the probability distribution and its parameter(s) and (2) state the formula] </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #554142 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=554142\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> p(smart pome) = .56,  n = 20<BR>\n" );
document.write( "P(x < 5) = binomcdf(20, .56, 4)= P(0) + P(1) + P(2) + P(3) + P(4) <BR>\n" );
document.write( "Where<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=P%28x%29=+highlight_green%28nCx%29%28p%5Ex%29%28q%29%5E%28n-x%29+ ALIGN=MIDDLE  ALT=\"P%28x%29=+highlight_green%28nCx%29%28p%5Ex%29%28q%29%5E%28n-x%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" > <BR>\n" );
document.write( "p and q are the probabilities of success and failure respectively. <BR>\n" );
document.write( "In this case p = .56 and q = .44, n = 20<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=nCx+=+%28n%21%29%2Fx%21%28n+-+x%29%21%29 ALIGN=MIDDLE  ALT=\"nCx+=+%28n%21%29%2Fx%21%28n+-+x%29%21%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > <BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );