Let X represent the full height of a certain species of tree. Assume that X has a normal probability distribution with = 203.6 ft and = 90 ft. You intend to measure a random sample of n = 66 trees. a. What is the mean of the distribution of sample means? P=== ft b. What is the standard deviation of the distribution of sample means (i.e., the standard error in estimating the mean)? ft