a. Based on the graph, we can see that in the month of January, March, and April, the sales at the South Location were less than $13,000 while for the North Location, it only happened in January.
Since the question states "either-or", meaning any of the two locations, we can see that the sales at either of the location were less than $13, 000 for 3 months (January, March, and April).
b. Based on the graph, the total sales that the South location had in April is $11,000. If there were 550 customers during that month, to get the average amount each customer spent, simply divide the sales by the number of customers.
[tex]11,000\div550=20[/tex]
Therefore, each customer at the South Location in April spent an average of $20.
c. If their estimated average monthly sale is $14, 000, then to get the estimated total sale for the whole year, we will multiply 14,000 by 12.
[tex]14,000\times12=168,000[/tex]
Hence, the estimated sales will be between $160,000 and $180,000 for the whole year in the North Location.