Warren Morrison
11/21/2023 · Middle School
The overhead reach distances of adult females are normally distributed with a mean of 200 cm and a standard deviation of 8.9 cm. a. Find the probability that an individual distance is greater than 213.40 cm . b. Find the probability that the mean for 15 randomly selected distances is greater than 198.50 cm . c. Why can the normal distribution be used in part (b), even though the sample size does not exceed 30 ? 1
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a. The probability that an individual distance is greater than 213.40 cm is approximately 0.0668 or 6.68%.
b. The probability that the mean for 15 randomly selected distances is greater than 198.50 cm is approximately 0.7422 or 74.22%.
c. The normal distribution can be used in part (b) because the population is normally distributed, and the Central Limit Theorem allows us to use the normal distribution for the sampling distribution of the sample mean, regardless of the sample size.
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