document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1119698>Question 1119698</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A golfer is shopping for a golf ball. He wants to make sure that the brand has a desirable spin rate. He estimates ideal ball has a spin rate of about 7000 revolutions per minute for a five-iron shot. To test, the golfer hits the ball on 76 five-iron shots, and a computer measures the spin rate for each shot. The computer then produces\r<BR>\n" );
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document.write( "5000 to 5500 = 5<BR>\n" );
document.write( "5500 to 6000 = 10<BR>\n" );
document.write( "6000 to 6500 = 14<BR>\n" );
document.write( "6500 to 7000 = 22<BR>\n" );
document.write( "7000 to 7500 = 19<BR>\n" );
document.write( "7500 to 8000 = 6\r<BR>\n" );
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document.write( "estimate the mean spin rate (in revolutions per minute) for the sample of five-iron shots.\r<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 #735311 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=735311\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A golfer is shopping for a golf ball. He wants to make sure that the brand has a desirable spin rate. He estimates ideal ball has a spin rate of about 7000 revolutions per minute for a five-iron shot. To test, the golfer hits the ball on 76 five-iron shots, and a computer measures the spin rate for each shot. The computer then produces <BR>\n" );
document.write( "5000 to 5500 = 5<BR>\n" );
document.write( "5500 to 6000 = 10<BR>\n" );
document.write( "6000 to 6500 = 14<BR>\n" );
document.write( "6500 to 7000 = 22<BR>\n" );
document.write( "7000 to 7500 = 19<BR>\n" );
document.write( "7500 to 8000 = 6 <BR>\n" );
document.write( "estimate the mean spin rate (in revolutions per minute) for the sample of five-iron shots. <BR>\n" );
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document.write( "Procedure::<BR>\n" );
document.write( "1. Find the midpoint value of each class.<BR>\n" );
document.write( "2. Multiply each midpoint value by the listed frequency for its class<BR>\n" );
document.write( "3. Add those products<BR>\n" );
document.write( "4. Divide the sum of those products by the sum of the frequencies.<BR>\n" );
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document.write( "Examples::<BR>\n" );
document.write( "mean times freq:: (5000+5500)/2 * 5 = 5250*5 = 26250<BR>\n" );
document.write( "mean times freq:: (5500+6000)/2 * 10 = 5750*10 = 57500<BR>\n" );
document.write( "etc<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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