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The heights of pecan trees are normally distributed with a mean of 10 feet and a standard deviation of 2 feet.
Showing and explaining....
a). What is the probability that a randomly selected pecan tree is between 9 and 12 feet tall? (Round the answer to 4 decimal places)
b). Find the 75th percentile of the pecan tree height distribution. (Round the answer to 2 decimal places)
c). For a sample of 64 pecan trees, state the standard deviation of the sample mean (the "standard error of the mean"). (Round your answer to three decimal places)
d). Suppose a sample of 64 pecan trees is taken. Find the probability that the sample mean heights is between 9.5 and 10 feet. (Round your answer to four decimal places)
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