Let X represent the full height of a certain species of tree. Assume that X has a normal probability distribution with u = 156.9 ft and o = 60.4 ft. You intend to measure a random sample of n = 50 trees. What is the mean of the distribution of sample means? HI = ft What is the standard deviation of the distribution of sample means (i.e., the standard error in estimating the mean)? (Report answer accurate to 2 decimal places.) ft Check