document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=821282>Question 821282</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Mimi just started her tennis class three weeks ago. On average, she is able to return 15% of her opponent’s serves. If her opponent serves 10 times, please answer the following questions: \r<BR>\n" );
document.write( "\n" );
document.write( "Find the probability that she returns at most 2 of the 10 serves from her opponent. \r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "How many serves is she expected to return? <BR>\n" );
document.write( ".15*10= 1.5, or we can round up to say that she’s expected to return 2 of the 10 serves. <--- is that correct? And if so, doesn't that answer the above problem in a backwards way? \r<BR>\n" );
document.write( "\n" );
document.write( "I can't figure out how to approach the first problem, and I attempted the second. Can you tell me how to work on the first problem and if I'm on the right track with the second one? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #494000 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=494000\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Mimi just started her tennis class three weeks ago. On average, she is able to return 15% of her opponent’s serves. If her opponent serves 10 times, please answer the following questions: <BR>\n" );
document.write( "Find the probability that she returns at most 2 of the 10 serves from her opponent.<BR>\n" );
document.write( "Binomial Problem with n= 10 and p(return) = 0.15<BR>\n" );
document.write( "P(0<= x <=2) = binomcdf(10,0.15,2) = 0.8202<BR>\n" );
document.write( "----------------------------------------------------- \r<BR>\n" );
document.write( "\n" );
document.write( "How many serves is she expected to return? <BR>\n" );
document.write( "u = np = 0.15*10= 1.5<BR>\n" );
document.write( "Comment on your question: The 1st question asks for a probability.<BR>\n" );
document.write( "The 2nd question asks for a count.  The answer is 1.5, not 2.<BR>\n" );
document.write( "---------------------<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "================ </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );