Study the given graph and answer the question that follows.
The graph shows data related to number of students enrolled for a vocational course in two institutes (X and Y) during three years.
What is the difference between the average number of students enrolled in institute X in 2010 and 2011 and that in institute Y in 2011 and 2012?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 20.
Given that
The total number of students enrolled in institute X in 2010 and 2011 = 320 + 240 = 560
The total number of students enrolled in institute Y in 2011 and 2012 = 320 + 200 = 520
According to the question
The average number of students enrolled in institute X in 2010 and 2011 = 560/2 = 280
The average number of students enrolled in institute Y in 2011 and 2012 = 520/2 = 260
Hence, the required difference = 280 - 260 = 20