[R] Average of a variable against another.

[Keeeeeeee]

Actually, the way you did is wrong.
You ignore an instruction that "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."
That is, you can't ignore the ages between year_1 and year_2.

The below table is to help you understand what this problem suggests.

Anyways thanks.  
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