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A study of the time required for airplanes to land at a certain airport shows that...

A study of the time required for airplanes to land at a certain airport shows that the mean is 280 seconds with a standard deviation of 20 seconds. (The times are NOT normally distributed.) a) Find the mean and standard deviation of the sample mean for samples of size 36 . μ ¯ x = σ ¯ x = (Write your answer as a decimal, rounded to 2 decimal places.) b) For samples of size 36 , find the percentage of sample means that are between 275 and 285. Write your answer as a percentage, rounded to 2 decimal places. %

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