In economy seat group, how many oxygen masks are there?

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Multiple Choice

In economy seat group, how many oxygen masks are there?

Explanation:
Emergency oxygen systems are designed with redundancy and grouped access in mind. In the B737-700 economy layout, masks are organized by seat group, and each group includes one extra oxygen mask beyond the masks assigned to the passengers in that group. That extra mask provides a reserve within the group so the system can still supply oxygen if a mask in the group is unavailable or needs replacement. So, there is one extra mask per seat group. The other options would either imply too many masks (per passenger) or remove or exceed the designed redundancy.

Emergency oxygen systems are designed with redundancy and grouped access in mind. In the B737-700 economy layout, masks are organized by seat group, and each group includes one extra oxygen mask beyond the masks assigned to the passengers in that group. That extra mask provides a reserve within the group so the system can still supply oxygen if a mask in the group is unavailable or needs replacement. So, there is one extra mask per seat group. The other options would either imply too many masks (per passenger) or remove or exceed the designed redundancy.

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