I need the Percent relative standard deviation for this. Thanks

A second group of students performed the experiment to determine the percentage of sugar in Bazooka chewing gum. The results were 62.5%,68.5%, and 62.5%, and 67.7%. The mean is 65.3%. The average deviation is 2.8%. (a) Calculate the percent relative standard deviation. Based on the percent precision, did the second group have better or worse precision than the first