document.write( "Question 1202552: The department store manager has prepared data on the sales volume of product A for 28 days (sample):
\n" ); document.write( "3;1;2;0;2;0;1;3;1;2;5;0;1;2;
\n" ); document.write( "0;0;1;1;0;1;2;3;5;2;1;0;3;0.
\n" ); document.write( "*Calculate the sample mean and variance. \n" ); document.write( "

Algebra.Com's Answer #837473 by mananth(16946) $\"\"$ $\"About$

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0,0,1,1,0,1,2,3,5,2,1,0,3,0,3,1,2,0,2,0,1,3,1,2,5,0,1,2 values (28)\r
\n" ); document.write( "\n" ); document.write( "Sum = 42, count =28 mean = 42/28 =1.5\r
\n" ); document.write( "\n" ); document.write( "subtract mean from each value above we get\r
\n" ); document.write( "\n" ); document.write( "-1.5, -1.5, -0.5, -0.5, -1.5, -0.5, 0.5, 1.5, 3.5, 0.5, -0.5, -1.5, 1.5, -1.5, 1.5, -0.5, 0.5, -1.5, 0.5, -1.5, -0.5, 1.5, -0.5, 0.5, 3.5, -1.5, -0.5, 0.5\r
\n" ); document.write( "\n" ); document.write( "Take the square of of each of the above difference\r
\n" ); document.write( "\n" ); document.write( "2.25, 2.25, 0.25, 0.25, 2.25, 0.25, 0.25, 2.25, 12.25, 0.25, 0.25, 2.25, 2.25, 2.25, 2.25, 0.25, 0.25, 2.25, 0.25, 2.25, 0.25, 2.25, 0.25, 0.25, 12.25, 2.25, 0.25, 0.25\r
\n" ); document.write( "\n" ); document.write( "Total the values =55\r
\n" ); document.write( "\n" ); document.write( "55/28 = 1.964285714 = variance\r
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\n" ); document.write( "\n" ); document.write( " $\"+sigma%5E2+=+sqrt%28variance%29\"$ \r
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\n" ); document.write( "\n" ); document.write( "1.401529776 = standard deviation.\r
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