document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=782759>Question 782759</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 2.	Find the standard deviation and coefficient of skewness for the following distribution<BR>\n" );
document.write( "Variable 	0-5	5-10	10-15	15-20	20-25	25-30	30-35	35-40<BR>\n" );
document.write( "Frequency	2	5	7	13	21	16	8	3\r<BR>\n" );
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document.write( "3.	A salesman has a 60% chance of making a sale to any one customer. The behaviour of successive customers is independent. If two customers A and B enter, what is the probability that the salesman will make a sale to A or B.\r<BR>\n" );
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document.write( "4.	To verify whether a course in Research Methodology improved performance, a similar test was given to 12 participants before and after the course. The original marks and after the course marks are given below:<BR>\n" );
document.write( "Original Marks	44	40	61	52	32	44	70	41	67	72	53	72<BR>\n" );
document.write( "Marks after the course	53	38	69	57	46	39	73	48	73	74	60	78<BR>\n" );
document.write( "Was the course useful? Consider these 12 participants as a sample from a population.<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #476555 by </B><A HREF=/tutors/aboutme.mpl?userid=edjones><B>edjones(8007)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=edjones><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=edjones><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=476555\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 3.	A salesman has a 60% chance of making a sale to any one customer. The behaviour of successive customers is independent. If two customers A and B enter, what is the probability that the salesman will make a sale to A or B.<BR>\n" );
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document.write( ".6*.6=.36 probability the salesman will make a sale to both of them. .6-.36=0.24 the probability he will make a sale to only the first one of them he meets.  .24 the probability he makes a sale only the second one he meets.<BR>\n" );
document.write( ".36+.24+.24=0.84 the probability that the salesman will make a sale to A or B. <BR>\n" );
document.write( "Drawing an Venn diagram of the situation will clarify things.<BR>\n" );
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document.write( "Ed </SPAN>\n" );
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