A study of commuting times reports the travel times to work of a random sample of 20 employed adults in New York State. The mean is x = 31.25 minutes...

A study of commuting times reports the travel times to work of a random sample of 20 employed adults in New York State. The mean is x = 31.25 minutes and the standard deviation is s = 21.88 minutes. What is the standard error of the sample mean, x? Enter your answer to 2 decimal places.