Unformatted text preview: divided by the number of individuals. mean = x = [1 + 4(2) + 7(3) + 31(4) + 56(5) + 17(6) + 4(7)] (1 + 4 + 7 + 31 + 56 + 17 +4) – = 564 / 120 = 4.7 average number of bristle/individual The variance is useful for studying the distribution of measurements around the mean and is defined in this example as variance = s 2 = average of the (actual bristle count – mean) 2 = 1 / 120 ∑ [(1 – 4.7) 2 + (2 – 4.7) 2 + (3 – 4.7) 2 + (4 – 4.7) 2 + (5 – 4.7) 2 + (6 – 4.7) 2 + (7 – 4.7) 2 ] = 0.26 The standard deviation, another measurement of the distribution, is simply calculated as the square root of the variance. standard deviation = s = 0.26 = 0.51...
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 Fall '05
 Gunaratne
 Genetics, Standard Deviation, Evolution, simple Mendelian genetics, actual bristle count

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