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Statistics questions

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The lengths of nails mean of 3.15 centimeters standard deviation of 0.08 centimeters find the two lengths that separate the top 10% and the bottom 10%

Mar 2nd, 2015

z-scores for upper and lower 10% correspond to    z = -1.28, +1.28

+/-1.28 * 0.08 cm = +/- 0.1024 cm.

3.15 cm + 0.1024 cm = 3.2524 cm

3.15 cm - 0.1024 cm = 3.0476 cm


Mar 2nd, 2015

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