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Consider that the average areas are disseminated by age of manager and that the first 8 agricultural holdings (holding IDs from 4 to 11) have a manager whose age falls in the same age band.
Common land units should not have recorded information on managers. Thus, the average UAA under scenario 1 cannot be computed because it is unclear how to distribute the number and area of common land units by age bands.
For scenario 2 and scenario 3, the same computations as above but now only for the first age band lead to the following results.
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