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Calculate the mean plant height, the variance and the standard deviation for 10 plants that have the following heights: 5 cm, 6 cm, 6 cm, 7 cm, 7 cm, 7 cm, 8 cm, 9 cm, 9 cm, and 10 cmA. mean: 7.4 cm, variance: 2.5 cm^2; standard deviation: 1.6 cmB. mean: 7.5 cm, variance: 3.5 cm^2, standard deviation: 1.6 cmC. mean: 7.4 cm, variance: 2.5 cm^2, standard deviation: 1.9 cmD. mean: 7 cm, variance: 3.5 cm^2, standard deviation: 1.9 cm
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