document.write( "Question 986658: The data below represents the score on an Algebra test. Determine the population mean score and standard deviation. \r
\n" ); document.write( "\n" ); document.write( "Score Number of students
\n" ); document.write( "50-59 2
\n" ); document.write( "60-69 3
\n" ); document.write( "70-79 7
\n" ); document.write( "80-89 10
\n" ); document.write( "90-99 8 \n" ); document.write( "
Algebra.Com's Answer #607426 by stanbon(75887)\"\" \"About 
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The data below represents the score on an Algebra test. Determine the population mean score and standard deviation.
\n" ); document.write( "Score Number of students
\n" ); document.write( "50-59 2 ::: Mark is 54.5::: sum = 2*54.5 = 109
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\n" ); document.write( "60-69 3 ::: Mark is 64.5::: sum = 3*64.5 = 193.5
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\n" ); document.write( "70-79 7 ::: Mark is 74.5::: sum = 7*74.5 = 521.5
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\n" ); document.write( "80-89 10::: Mark is 84.5 ::: sum = 10*84.5 = 845
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\n" ); document.write( "90-99 8 ::: Mark is 94.5 ::: sum = 8*94.5 = 756
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\n" ); document.write( "Mean = (sum of the sums)/(sum of the frequencies) 80.83
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\n" ); document.write( "Using the mean you can figure out the standard deviation.
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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