Computing the estimated standard deviation

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During pregnancy and breastfeeding, obstetricians recommend mothers to supplement DHA in their diets to support the healthy development of the fetal brain, eye, and nervous system. The DHA content of a prenatal vitamin is normally distributed with a mean of 400 IU. If we take a random sample of 15 prenatal vitamins, what is the probability that the sample mean will be at least 350 IU if we assume the estimated standard deviation is 73.8 IU?

Reference no: EM132463496

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