How to calculate the number of units sold?
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Learn how many of the units in a condominum are lived in by their owners, and then divide that number by the total number of units there.
The answer depends on what information you have about profits per units sold, or on the costs and revenues per unit.
Then you have a surplus.
Count up the number of obseravtions made on the experimental units. That is the sample size.
You can calculate 13 + 56, and 13 - 56.