Find the Range, Variance and Standard Deviation of the following set:

1.) There are 45 students in a class. 5 students were randomly selected from this class and their heights (in cm) were recorded as follows:
131, 148, 139, 142, 152

2.) There were 105 oak trees in a forest. 6 were randomly selected and their heights were recorded in meters. Heights (in m) = {43, 65, 52, 70, 48, 57}