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8. If the foot length of women follows a normal distribution with a mean of 23 cm, and 81.5% have a foot length between 20

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8. If the foot length of women follows a normal distribution with a mean of 23 cm, and 81.5% have a foot length between 20 cm and 29 cm, what is your estimate of the standard deviation of the heights in this population? (a) 2.25 cm (b) 3 cm (c) 4.5 cm (d) 9 cm O a Ob OC D d

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