4. The heights of 18-year-old men are approximately normally distributed with mean 68 inches and standard deviation 3 inches. What is the probability that the average height x(bar) of a sample of twenty 18-year-old men will be less than 69 inches? Round your answer to four decimal places.
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Given standard deviation = 3 inches and sample size n = 20, SEM = 3 / sqrt(20) = 3 / 4.472 = 0.6708 inches. Show more…
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