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  3. the overhead reach distances of adults females are normally distributed...

Question: the overhead reach distances of adults females are normally distributed...

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the overhead reach distances of adults females are normally distributed with a mean of 195cm and a standard desviation of 8.9cm ..find the probability that an individual distance is greater than 208.40 cm ..find the probability that the mean for 20 randomly selected distances is greater than 193.70 cm. Why can the normal distribution be used in part (b), even though the sample size does not exceed 30

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