Question: The amount of timber available from a certain type of fully grown tree has a mean of 63400 with a standard deviation of 2500. (a)

The amount of timber available from a certain type of fully grown tree has a mean of 63400 with a standard deviation of 2500.
(a) What are the mean and the standard deviation of the total amount of timber available from 20 trees?
(b) What are the mean and the standard deviation of the average amount of timber available from 30 trees?

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