How wide and how tall was the outer fence around the tabernacle?

The outer fence around the tabernacle was about 75 feet wide and stood roughly seven and a half feet high, or two and a half cubits. It was built tall enough to prevent anyone from simply looking in, keeping the tabernacle area from the view of the casual onlooker.

Les explains that the outer fence measured about 75 feet wide and was approximately seven and a half feet, or two and a half cubits, high. It was made high enough that nobody could simply look in. The purpose of this outer fence was to keep all this from the view of the casual onlooker. He also notes the tabernacle was always set with the door or gate in that outer fence facing east.

Why was the outer fence around the tabernacle made so high?

The outer fence was made high—about seven and a half feet—so no one could simply look in. It screened the tabernacle area from the view of the casual onlooker, serving as a visual barrier to keep the sacred area from idle observation.