Total number of candidates who appeared and qualified in a competitive examination from different cities are given in the following bar graph. Study the bar graph carefully and answer the following question.

What is the difference between the average number of appeared candidates and the average number of qualified candidates in the exam from all the cities?

650

Average number of appeared candidate - Qualified candidate

= \(\frac{2500 + 3000+4500+1200}{4}\) - \(\frac{1350 + 2500+3900+850}{4}\)

= \(\frac{ 11200}{4}\) - \(\frac{ 8600}{4}\) 

= 2800 - 2150

= 650