How many oxygen masks are located at the Cabin Observer Jumpseat Station on the ERJ 175?

The correct answer is that there are two oxygen masks located at the Cabin Observer Jumpseat Station on the ERJ 175. In aviation safety design, the provision of multiple oxygen masks at strategic locations like the Cabin Observer Jumpseat ensures that crew members have immediate access to supplemental oxygen during emergencies where cabin pressure may be lost or if there is a fire or smoke. The presence of two masks allows for redundancy; if one mask malfunctions or is inaccessible for any reason, the other can be used. This design supports the safety and readiness of the crew to respond to in-flight emergencies effectively. Having enough oxygen masks ensures that the crew can maintain communication and manage the safety of passengers during critical situations.