Study the bar chart and answer the question based on it.
Production of Fertilizers by a Company (in 1000 tonnes) Over the Years
The average production of 1996 and 1997 was exactly equal to the average production of which of the following pairs of years?
2000 and 2001
1999 and 2000
1998 and 2000
1995 and 2001
Correct answer is D
Average production (in 10000 tonnes) of 1996 and 1997 (40 + 60)/2 = 50
We shall find the average production (in 10000 tonnes) for each of the given alternative pairs:
2000 and 2001 = (50 + 75)/2 = 62.5
1999 and 2000 = (65 + 50)/2 = 57.5
1998 and 2000 = (45 + 50)/2 = 47.5
1995 and 1999 = 25 + 65)/2 = 45
1995 and 2001 = 25 + 75)/2 = 50
Therefore the average production of 1996 and 1997 is equal to the average production of 1995 and 2001.
