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Bunuel
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There's only possibility of change in mode for South location and no possible change of mode can occur for remaining 2 locations.

I believe OA is incorrect.
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catinabox

shouldnt the answer choice be inverted? for north - since there are 3 already with 12 deliveries and the rest with 1 frequency, adding one more doesnt matter be it 12 or other number same for central and south should have yes, as it can be 11 and tie with 10
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Thanks for pointing this out- the answer choices got inverted and have been corrected.
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catinabox

shouldnt the answer choice be inverted? for north - since there are 3 already with 12 deliveries and the rest with 1 frequency, adding one more doesnt matter be it 12 or other number same for central and south should have yes, as it can be 11 and tie with 10
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Bunuel
The table shows the number of weekly deliveries completed by each of six delivery vans across three different regions. The number represents how many deliveries each van made in a typical week in that region.

VanNorthCentralSouth
A121410
B101411
C121510
D111312
E121410
F131211

Suppose a seventh van is added to the fleet and completes some number of deliveries in each region.

For each of the following regions, select Yes if it is possible for the mode (most frequently occurring value) of the weekly deliveries in that region to change with the inclusion of the seventh van’s data. Otherwise, select No.

Solution:

North region:
12 is the current mode (appears 3 times).
If the 7th van reports a value like 11 or 13 (which already appear once), that value could appear twice—setting up a possible mode change with future data.
Even a tie at 3 would alter the mode.
Answer: No

Central region:
14 is the mode (3 times); all other values appear only once.
Adding any one new value can make another value occur at most twice, which is not enough to change the mode.
Answer: No

South region:
10 is the mode (3 times); 11 appears twice.
If the 7th van reports 11, then both 10 and 11 appear 3 times, changing the mode from a single to a tie.
Answer: Yes
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