Suppose the visitors to a water park are known to have a mean age of 20.27 years, and a standard deviation of 6.55 years. We then take a random sample of 45 visitors to the park, and find that their mean age is 20.1 years. If we were to take repeated Samples of size 45 and calculate their means, what would we anticipate the standard deviation of the sample means to be? Round your answer to 4 decimal places.