IBPS SO Prelims Exam Model Paper 5

Number of candidates who appeared in 2009 whose age are equal to or less than 30 years = (3000 – 2000) = 1000
Number of candidates who appeared in 2010 whose age are equal to or less than 30 years = (5000 – 3000) = 2000
Number of candidates who appeared in 2011 whose age is equal or less than 30 years = (4500 – 1500) = 3000
Number of candidates who appeared in 2012 whose age are equal to or less than 30 years = (4500 – 2500) = 2000
Number of candidates who appeared in 2013 whose age are equal to or less than 30 years = (6000 – 2000) = 4000
Total number of candidates appeared whose age is equal to or less than 30 years over the years = (1000 + 2000 + 3000 + 2000 + 4000) = 12000
⇒ Required average =

12000

5

= 2400
∴ The average number of candidates whose ages is below or equal to 30 years and appeared in an exam over the years is 2400