Take it easy. I wrote that thank you.
Actually, the sentences "Get the average tall of the plant against year, for
all the years of available data.
The year_1 and year_2 are recorded so that a plant is alive if the year of a
question is equal to or grater than the year_1 and equal to and less than
the year_2. "
is just copied from the problem and that's all.
As well, the table I meant is just below
1999 2000 2001 2002 2003 2004 2005 2006 2007 2008
2009 2010
6 7 8 9 10 11 12
13 14 15 16
3 4 5 6
7 8 9 10
11 12 13
12 13 14 15
avg
6 7 8 6 25/3 ...etc.
Nevertheless, I am sorry if you couldn't understand what it means.
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