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Unformatted text preview: decimal places. the mean is (4+7+8+8+9+12)/6=48/6=8 x x  mean (x – mean)² 4 48=4 16 71 1 8 8 9 1 1 12 4 16 the sum of all the (xmean)² is the standard deviation squared (σ²) thus σ²=16+1+0+0+1+16=34 thus σ= 34 =5.83...
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This document was uploaded on 05/10/2011.
 Spring '11

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