Table:
0
A
B
C
D
1
Years ended December 31,
2
2019
2018
2017
3
Basic weighted-average shares outstanding
103.9
103.2
102.2
4
Effect of potential common stock:
5
Common stock awards
1.2
1.2
1.3
6
Diluted weighted-average shares outstanding
105.1
104.4
103.5

Questions and formulas:
Question: What is the average of basic weighted-average shares outstanding from 2017 to 2019?
Formula: (B3+C3+D3)/3 
Formula2: (B3+C3+D3)/3 
Level: Calculation
Question: What is the proportion of basic over diluted weighted-average shares outstanding in 2017?
Formula: D3/D6 
Formula2: D3/D6 
Level: Calculation
Question: What is the change in Diluted weighted-average shares outstanding between 2018 and 2019?
Formula: B6-C6
Formula2: B6-C6
Level: Calculation