Answer
Set B has a higher average, but set A has the larger spread.
Work Step by Step
Mean A: Add all the numbers and divide by 5 $=\frac{ 0+ 12+ 7 +19+ 21 }{5}=11.8$
Mean B: Add all the numbers and divide by 5 $=\frac{ 13+15+16+17+12}{5}=14.6$
Dataset B has the larger average.
Range A: The difference between the largest and smallest number: $21-0=21$
Range B: The difference between the largest and smallest number: $17-12=5$
Dataset A has the larger spread.
Set B has a higher average, but set A has the larger spread.
