Xfinity 1.2TB by 3 People in 31 Days ?!?

Brand new Xfinity Subscriber and first full month we supposedly are about to exceed the expanded data limit of 1.2 TB of data.

Someone please explain to me how three (3) people could possibly use 4.95 Gb each every single day for 31 days straight to culminate in exceeding 1.229 TB maximum set by Xfinity ?!?

Yes two of us streamed television shows while the third played Xbox Live daily, but isn't this a normal scenario?

Does Comcast/Xfinity provide details of which devices used how much data to customers to aid in troubleshooting?

Da Hoffs