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11. The heights of Year 10 girls at Harper Valley High School are normally distributed with a mean of 155 cm. If 80 % of

11. The heights of Year 10 girls at Harper Valley High School are normally distributed with a mean of 155 cm. If 80 % of the girls have a height less than 165 cm, then the standard deviation is: (a) 3.3 cm (b) 5.0 cm (c) 6.7 cm (d) 7.8 cm (e) 11.9 cm

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