Standard deviation - color coded sleep activity

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Each person in class Number of hours of sl eep (MINUS) Mean of number of hours of sleep (EQUALS) (subtract and put that number here) Pink box SQUARED! 2 1 6 6.15 -.15 .0225 2 6 6.15 -.15 .0225 3 8 6.15 1.85 3.4225 4 7 6.15 .85 .7225 5 4 6.15 -2.15 4.6225 6 6 6.15 -.15 .0225 7 7 6.15 .85 .7225 8 8 6.15 1.85 3.4225 9 6 6.15 -.15 .0225 10 5 6.15 -1.15 1.3225 11 7 6.15 .85 .7225 12 4 6.15 -2.15 4.6225 13 6 6.15 -.15 .0225 TOTAL: 80 (add above numbers) 19.895
Calculate Mean: Total hours of sleep 80 Divided by # of students 13 Mean 6.15
Calculate variance and standard deviation Sum of Squares 19.895 Divided by # of students 13 Variance 1.530 Standard deviation is the square root of the variance What is the square root of the variance? (purple box) 1.237
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