An industry consists of six firms with annual sales of $300, $500, $400, $700, $600, and $600, respectively. What is the industry's C4?

An industry consists of six firms with annual sales of $300, $500, $400, $700, $600, and $600, respectively. What is the industry's C4?

An industry consists of six firms with annual sales of $300, $500, $400, $700, $600, and $600, respectively. What is the industry's C4? 





A. 0.58.
B. 0.61.
C. 0.74.
D. 0.77.



Answer: D