document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=781074>Question 781074</A>: <I><SPAN STYLE=\"word-break: break-all;\"> In San Francisco, 30% of workers take public transportation daily.\r<BR>\n" );
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document.write( "a. In a sample of ten workers. what is the probability that exactly three workers take public transportation daily?\r<BR>\n" );
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document.write( "b. In a sample of 10 workers, what is the probability that at least three workers take public transportation daily?   </SPAN>\n" );
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document.write( "a)<BR>\n" );
document.write( "x=.3, y=.7<BR>\n" );
document.write( "10C3=120 Binomial Theorem<BR>\n" );
document.write( "120*x^3*y^7=.267<BR>\n" );
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document.write( "b)<BR>\n" );
document.write( "10C2=45<BR>\n" );
document.write( "45*x^2*y^8=.234<BR>\n" );
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document.write( "10C1=10<BR>\n" );
document.write( "10*x*y^9=.121<BR>\n" );
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document.write( "10C0=1<BR>\n" );
document.write( "y10=.7^10=.028<BR>\n" );
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document.write( ".234+.121+.028=.383 Probability of less than 3 workers taking public trans.<BR>\n" );
document.write( "1-.383=.617 the probability that at least three workers take public transportation daily.<BR>\n" );
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document.write( "Ed </SPAN>\n" );
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