Standard deviation of the sample mean


The heights of pecan trees are normally distributed with a mean of 10 feet and a standard deviation of 2 feet.

What is the probability that a randomly selected pecan is between 8 and 12 feet tall?

Find the 80th percentile of the pecan tree height distribution.

If a random sample of 64 pecan trees is selected, what is the standard deviation of the sample mean?

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Basic Statistics: Standard deviation of the sample mean
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