Answer:
Mean: 10
Median: 9
Mode: 9
Range: 17
Explanation:
Mean is adding all the numbers together then *divide by the number of numbers you added:
4 + 4 + 6 + 7 + 9 + 9 + 9 + 10 + 14 + 17 + 21 = 110
110 / 11 = 10
Median is the middle number: 9
The number that appears the most often is the mode: 9
The range is the difference between the lowest and highest number:
21 - 4 = 17