The ratio of the number of years, in which the foreign exchange reserves are above the average reserves, to those in which the reserves are below the average reserve, is:
3:5
Average foreign exchange reserves over the given period = 3480 million US $.
The country had reserves above 3480 million US duringtheyears1992−−93,1996−−97and1997−−98i.e.,for3yearsandbelow3480millionUS during the years 1991 -- 92, 1993 -- 94, 1995 -- 96 and 1998 - 99 i.e for 5 years.
Hence, required ratio = 3 : 5.