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In the comments of this answer it came up that the section on "Group Checks" states:

To make a group ability check, everyone in the group makes the ability check. If at least half the group succeeds, the whole group succeeds. Otherwise, the group fails...

It came up what does "half the group" mean when there also exists a rule on "Round Down":

There’s one more general rule you need to know at the outset. Whenever you divide a number in the game, round down if you end up with a fraction, even if the fraction is one-half or greater.

There are two possibilities brought up in those comments:

1. At least 1.5 people must succeed, and since you can't have half-people 2-3 people must succeed on the check.

2. The 1.5 people required rounds down to 1 person, so 1-3 people must succeed on the check.

Which of these interpretations is correct?

In the comments of this answer it came up that the section on "Group Checks" states:

To make a group ability check, everyone in the group makes the ability check. If at least half the group succeeds, the whole group succeeds. Otherwise, the group fails...

It came up what does "half the group" mean when there also exists a rule on "Round Down":

There’s one more general rule you need to know at the outset. Whenever you divide a number in the game, round down if you end up with a fraction, even if the fraction is one-half or greater.

There are two possibilities brought up in those comments:

1. At least 1.5 people must succeed, and since you can't have half-people 2 or more people must succeed on the check.

2. The 1.5 people required rounds down to 1 person, so 1 or more people must succeed on the check.

Which of these interpretations is correct?