
Chapter 3
PB
Measures of Central Tendency
91
Year Percentage increase in sales
2003–2004 5
2004–2005 8
2005–2006 12
2006–2007 17
2007–2008 25
3B4. The following data gives the production of wheat (in
million tonnes) along with percentage coverage under
irrigation in India from 1982–1983 to 2003–2004.
Calculate the average production of wheat from
1982–1983 to 1992–1993 and 1993–1994 to 2003–
2004. Also compute the average percentage cover-
age under irrigation from 1982–1983 to 1992–1993
and 1993–1994 to 2003–2004.
Year Production of
wheat (in million
tonnes)
Percentage
coverage under
irrigation
1982–1983 42.79 72.5
1983–1984 45.48 73
1984–1985 44.07 74.5 ...