21, 42, 63, 84, 105, 126, 147
Total numbers in set: 7
Mean (Average) 84
Median (Middle): 84
Mode (Most Common): No mode of this set
Range (Biggest - Smallest): 126
Mean is the average of all data in set.
Median is the value which occurs most frequently in a data set.
Range is the difference between the largest, and smallest data set.
Hope that helps!!!!