document.write( "Question 878744: I need to understand how to do the step to get the answer, for future question.\r
\n" ); document.write( "\n" ); document.write( "What are the big corporations doing with their wealth? One way to answer this question is to examine profits as percentage of assets. A random sample of 50 Fortune 500 companies gave the following information. \r
\n" ); document.write( "\n" ); document.write( "Profit as percentage of assets 8.6-12.5 12.6-16.5 16.6-20.5 20.6-24.5 24.6-28.5
\n" ); document.write( "Number of companies 13 16 5 4 12
\n" ); document.write( "Estimate the sample mean, sample variance, and sample standard deviation for profit as percentage of assets. (Round your answers to one decimal place.) \r
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Algebra.Com's Answer #530244 by ewatrrr(24785) $\"\"$ $\"About$

You can put this solution on YOUR website!

 
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document.write( "Hi
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document.write( "My recommendation would be an Excel electronic worksheet
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document.write( "0r something similar. Key is: (12.5-8.6)/2 = 1.95 and 8.6+1.95 = 10.55, for ex
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document.write( "x	n	 xn	x -17.43 n(x -17.43)^2	
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document.write( "10.55	13	137.15	-6.88	615.3472	
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document.write( "14.55	16	232.8	-2.88	132.7104	
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document.write( "18.55	5	92.75	1.12	6.272	
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document.write( "22.55	4	90.2	5.12	104.8576	
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document.write( "26.55	12	318.6	9.12	998.0928	
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document.write( "					
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document.write( "	50	871.5	5.6	1857.28 (sum)	
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document.write( "	mean	17.43		37.90367347	Variance sum/(n-1)
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document.write( "				6.156595932	SD (sqrt of variance)
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