#### Answer

Set C: mean = 6.7, range = 3.8
Set D: mean = 9.025, range = 28.3

#### Work Step by Step

To find the mean, we add up all of the values and divide by the total number of values.
Mean C: $\frac{4.5+7.1+8.3+6.9}{4} = 6.7$
Mean D: $\frac{2.1+29.5+1.2+3.3}{4} = 9.025$
To find the range, we subtract the smallest term from the largest term.
Range C: $8.3-4.5 = 3.8$
Range D: $29.5-1.2 = 28.3$
The mean and range of Set D are greater than the mean and range of Set C.