The given bar graph represents the production and sales of a certain crop in quintals by the farmers F1,F2, F3 and F4. What is the average of a crop in quintals, sold by the all farmers?

470 490 510 530

490

Total sale of all farmers = 410 + 500 + 430 + 620 = 1960 Average of sale = \(\frac{1960 }{4}\) = 490