document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1087848>Question 1087848</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Type O blood is found in 44% of Americans. Suppose 7 samples of blood are tested at random. Find the probability that exactly 2 of the tested samples will be Type O. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #702129 by </B><A HREF=/tutors/aboutme.mpl?userid=rothauserc><B>rothauserc(4718)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=rothauserc><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=rothauserc><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=702129\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> use the binomial probability formula<BR>\n" );
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document.write( "Probability (P) ( k successes in n trials ) = nCk * p^k * (1-p)^(n-k), where<BR>\n" );
document.write( "nCk = n! / (k! * (n-k)!)<BR>\n" );
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document.write( "P ( exactly 2 have type O blood out of 7 trials ) = 7C2 * (0.44)^2 * (1-0.44)^(7-2) = 0.2239 approx 0.22<BR>\n" );
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document.write( "P of exactly 2 with type O out of 7 trials = 0.22<BR>\n" );
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