That data was pulled during a 9 hour period (noon-3, 3-6, and 6-9). You can easily use that much data watching video, especially if you have a high res display and are downloading 1080p resolution videos. If that line has an iPhone 6 Plus, it will automatically download 1080p resolution videos, and eat through your data much quicker than if it's an older iPad that only supports 1024x768 resolution.
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