Total production of fertilizers (in 10,000 tonnes) in the given years is :
= 25 + 40 + 60 + 45 + 65 + 50 + 75 + 80 = 440
=> Average production = $$\frac{440}{8}=55$$
$$\therefore$$ The number of years in which the production of fertilizers was more than average production of the given years = 1997, 1999, 2001 and 2002
